How many words end in UM?

This page lists 712 words ending in UM, each with its Scrabble score.

Why are -UM words useful?

Words ending in UM are great for hooking onto existing tiles and pluralising or extending words already on the board.

Words Ending With UM

All 712 words in our dictionary that end in UM, sorted by Scrabble score. Perfect for hooks and crossword clues.

712 words · number = Scrabble score · sorted highest score first

quinquennium32 hexamethonium30 chrysanthemum28 disequilibrium28 nonequilibrium27 zoosporangium27 archaebacterium26 bryophyllum26 corynebacterium26 mycobacterium26 xiphisternum26 cladophyllum25 cyanobacterium25 quadrivium25 rhizobium25 chondrocranium24 equilibrium24 microsporangium24 perionychium24 podophyllum24 unnilquadium24 colloquium23 cypripedium23 decamethonium23 hypanthium23 jejunum23 mazaedium23 perichondrium23 phosphonium23 pyxidium23 quadrennium23 sempervivum23 unnilhexium23 megasporangium22 panjandrum22 praseodymium22 rutherfordium22 tetrazolium22 trapezium22 zirconium22 archesporium21 cymbidium21 diazonium21 enterobacterium21 epithalamium21 exemplum21 hibernaculum21 mezereum21 phyllodium21 prothalamium21 sequestrum21 spermatogonium21 subphylum21 zooecium21 cockalorum20 colchicum20 diverticulum20 effluvium20 equisetum20 infundibulum20 lixivium20 lycopodium20 maximum20 molybdenum20 monochasium20 myocardium20 perithecium20 procambium20 pseudopodium20 superpremium20 vexillum20 zoecium20 apothecium19 aquarium19 archegonium19 armamentarium19 blackgum19 columbarium19 compendium19 endothecium19 extremum19 exuvium19 glochidium19 hesperidium19 hormogonium19 hypogeum19 meerschaum19 mendelevium19 perimysium19 promethium19 propylaeum19 pycnidium19 pyrethrum19 spermagonium19 stylopodium19 sympodium19 syncytium19 ambulacrum18 appressorium18 bronchium18 bubblegum18 californium18 candelabrum18 carpogonium18 coccidium18 condominium18 definiendum18 delphinium18 dysprosium18 epimysium18 exordium18 hydronium18 hymenium18 mesothelium18 nephridium18 opprobrium18 pandemonium18 paramecium18 paramylum18 pericardium18 principium18 proctodaeum18 protactinium18 prothallium18 quantum18 radiothorium18 stumblebum18 suboptimum18 succedaneum18 symposium18 ultravacuum18 zoarium18 animalculum17 antheridium17 berkelium17 brachium17 cafetorium17 chromium17 columbium17 corrigendum17 crematorium17 cubiculum17 cymatium17 dichasium17 didymium17 endocardium17 endothelium17 epicardium17 epithelium17 florilegium17 gametangium17 gymnasium17 gynaeceum17 gynaecium17 gynoecium17 incunabulum17 involucrum17 jugulum17 kettledrum17 latifundium17 lawrencium17 memorandum17 miracidium17 mycelium17 neodymium17 odontoglossum17 ommatidium17 parapodium17 penicillium17 pericranium17 pittosporum17 plasmodium17 polygonum17 practicum17 primordium17 pterygium17 pygidium17 quorum17 radiostrontium17 scriptorium17 skookum17 technetium17 tympanum17 uropygium17 acetabulum16 antependium16 antirrhinum16 aspergillum16 asphaltum16 beryllium16 calvarium16 capsicum16 cerebellum16 clostridium16 colluvium16 collyrium16 curriculum16 endometrium16 epicedium16 epidendrum16 euphonium16 flabellum16 gynecium16 harmonium16 herbarium16 hospitium16 magisterium16 mediastinum16 nonpetroleum16 pancratium16 pelargonium16 phylum16 polemonium16 postbellum16 postpartum16 proscenium16 prostomium16 puerperium16 referendum16 simulacrum16 spermatium16 sphagnum16 sporogonium16 staminodium16 superstratum16 unnilpentium16 vivarium16 ytterbium16 americium15 androecium15 anthodium15 argumentum15 ascogonium15 bacterium15 bothrium15 calcaneum15 cambium15 capitulum15 cardamum15 credendum15 crumbum15 desideratum15 factotum15 flagellum15 francium15 furculum15 hafnium15 hahnium15 haustellum15 haustorium15 honorarium15 humdrum15 jugum15 leprosarium15 manubrium15 marsupium15 nonaluminum15 operculum15 opusculum15 osmiridium15 perineurium15 philtrum15 planetarium15 plumbum15 positronium15 praesidium15 psyllium15 retinaculum15 scholium15 seaborgium15 sporangium15 stickum15 stomodaeum15 syconium15 termitarium15 vasculum15 vestigium15 viaticum15 viburnum15 vinculum15 wampum15 abomasum14 aciculum14 ammonium14 antebellum14 anthurium14 athenaeum14 bunkum14 cadmium14 caldarium14 cementum14 cerebrum14 chetrum14 chillum14 ciborium14 cinerarium14 collegium14 consortium14 contagium14 conundrum14 coremium14 ctenidium14 decennium14 diluvium14 doronicum14 emporium14 encomium14 epineurium14 fermium14 fulcrum14 gadolinium14 gelsemium14 germanium14 gypsum14 hokum14 holmium14 imperium14 indecorum14 interregnum14 ischium14 jorum14 khoum14 lanthanum14 lebensraum14 magnesium14 meconium14 millennium14 modicum14 momentum14 moratorium14 oceanarium14 osmeterium14 palladium14 peculium14 peponium14 periosteum14 peritoneum14 petrolatum14 plectrum14 presidium14 psalterium14 pudendum14 puparium14 refugium14 ruthenium14 sclerotium14 spectrum14 speculum14 spiculum14 stewbum14 stomodeum14 stramonium14 substratum14 sugarplum14 sulfonium14 tegmentum14 timpanum14 transuranium14 triclinium14 trifolium14 triforium14 vanadium14 addendum13 aecidium13 alluvium13 aluminium13 amylum13 arboretum13 ascidium13 atheneum13 auditorium13 baculum13 basidium13 bdellium13 botulinum13 caladium13 calcium13 castoreum13 cingulum13 claustrum13 clitellum13 coagulum13 colosseum13 colostrum13 conidium13 continuum13 corundum13 criterium13 dinkum13 dominium13 einsteinium13 frenulum13 galbanum13 glucinum13 guaiacum13 guaiocum13 hoodlum13 illuvium13 indicium13 labdanum13 lyceum13 mausoleum13 menstruum13 minimum13 neptunium13 oncidium13 optimum13 ostensorium13 pabulum13 panicum13 patagium13 pendulum13 peridium13 petroleum13 plutonium13 pollinium13 pomatum13 potassium13 premium13 reptilium13 responsum13 reticulum13 rhodium13 rubidium13 sacrarium13 sarmentum13 scandium13 scutellum13 secundum13 septarium13 skellum13 smeddum13 sorghum13 spirillum13 sudatorium13 tenaculum13 thallium13 ultimatum13 vacuum13 variorum13 velarium13 veratrum13 aconitum12 actinium12 adytum12 aerobium12 alburnum12 aluminum12 alyssum12 apterium12 biennium12 bluegum12 caecum12 coliseum12 cuprum12 decorum12 dentalium12 deuterium12 dumdum12 duodenum12 electrum12 eluvium12 elytrum12 endosteum12 europium12 fraenum12 frustum12 gonidium12 inoculum12 kalium12 labellum12 laburnum12 lithium12 lomentum12 lutecium12 masurium12 nasturtium12 natatorium12 nobelium12 olibanum12 outswum12 pablum12 peplum12 perineum12 plastrum12 platinum12 polonium12 pronotum12 ramentum12 rhenium12 samarium12 sanatorium12 sanitarium12 sanitorium12 sargassum12 sestertium12 silicium12 slumgum12 splenium12 thorium12 thulium12 tomentum12 triticum12 trivium12 unguentum12 uredinium12 yttrium12 agendum11 ageratum11 allodium11 antiserum11 arcanum11 argentum11 asylum11 blellum11 caesium11 cecum11 centrum11 chum11 cranium11 crissum11 cundum11 delirium11 dictum11 diestrum11 eulogium11 ferrum11 folium11 frenum11 geranium11 helium11 indusium11 labarum11 laudanum11 magnum11 medium11 muonium11 ngultrum11 niobium11 oakum11 omentum11 oogonium11 opossum11 origanum11 osculum11 pallium11 pantoum11 pinetum11 podium11 protium11 residuum11 rostellum11 sanctum11 scrotum11 sedilium11 sensillum11 sensorium11 stibium11 strontium11 subgum11 sudarium11 tapetum11 tellurium11 terbium11 terrarium11 triennium11 vellum11 acetum10 aecium10 alodium10 barium10 begum10 centum10 cerium10 cesium10 cilium10 conium10 corium10 crinum10 curium10 dirdum10 eardrum10 erbium10 fanum10 filum10 forum10 gallium10 hilum10 illinium10 iridium10 labium10 labrum10 ladanum10 linoleum10 lutetium10 mentum10 milium10 minium10 museum10 omasum10 organum10 osmium10 pileum10 plenum10 possum10 rectum10 rheum10 rosarium10 sacrum10 scutum10 selenium10 septum10 solarium10 solatium10 sputum10 stadium10 talcum10 tantalum10 tectum10 teetotum10 thrum10 titanium10 triduum10 trillium10 uredium10 velum10 album9 degum9 dorsum9 erratum9 gonium9 granum9 imaum9 indium9 locum9 lustrum9 natrium9 nostrum9 oestrum9 oidium9 opium9 ovum9 radium9 regnum9 rostrum9 scrum9 sebum9 sistrum9 sodium9 solanum9 stannum9 sternum9 stratum9 swum9 tantrum9 tedium9 tergum9 tetotum9 tritium9 uranium9 alarum8 algum8 allium8 antrum8 asarum8 atrium8 datum8 durum8 estrum8 hum8 ionium8 iterum8 luteum8 odeum8 odium8 ostium8 plum8 sagum8 scum8 sedum8 sensum8 telium8 yum8 aurum7 bum7 cum7 doum7 drum7 gaum7 geum7 glum7 grum7 ileum7 ilium7 larum7 linum7 mum7 notum7 oleum7 onium7 serum7 solum7 strum7 alum6 arum6 gum6 neum6 slum6 stum6 lum5 rum5 sum5

Hooking with -UM words

Endings like -UM let you tack a word onto a tile already on the board, often turning a small play into a big one. Look for the high-value entries above to maximise points.

A quick statistical tour

The shape of this list: 712 entries between 3 and 15 letters long, peaking at 8 letters with 149 words. Five-letter picks number 39 and seven-letter picks 98. Nothing here outscores QUINQUENNIUM — 32 points from 12 tiles on plain squares.

The five biggest scorers on the page: QUINQUENNIUM (32), HEXAMETHONIUM (30), CHRYSANTHEMUM (28), DISEQUILIBRIUM (28), NONEQUILIBRIUM (27). At 15 letters, ARCHAEBACTERIUM is the longest word on the list; a typical entry scores around 14. Letter-wise, U is the workhorse — it appears in 712 of these words, ahead of M (712) and I (447).

Three easy picks from this list

ALARUM — a 6-letter, 8-point play that slots into tight board lanes where longer words won't fit.
Playing ALLIUM across a double-word square turns its base 8 points into 16 — solid value for 6 tiles.
ANTRUM earns 8 points from just 6 tiles — and it is a word few opponents will bother to challenge.

Five more everyday options from the same list: ASARUM (8), ATRIUM (8), ESTRUM (8), IONIUM (8), ITERUM (8).

-UM as a board weapon

A reliable habit: every time you learn a new -UM word, note whether it also takes a front extension. Words that extend at both ends are the ones that turn a 12-point play into a 40-point one, because you can bridge two premium squares. The top of this list — sorted by score — is where those double-duty words hide.

More endings

Narrow it down

Pair an ending with a length or starting letter in the Word Finder.