There are 205 words that start with OO in our word list of 382,657 words, and every one of them is on this page — grouped by length so you can scan fast, with a live filter when you need something narrower. The biggest group is the 7-letter words (47 of them); the spread is 1 of them 2 letters long, 8 of them 3 letters long, 16 of them 4 letters long, 15 of them 5 letters long, and more up to 15 letters. The longest entries are oophorectomized, oophoroepilepsy and oophorectomies. Word-game players keep lists like this open for a reason: Scrabble and Words With Friends reward the obscure corners of the dictionary, crossword solvers live on pattern matching, and Wordle players work by elimination.
The full list
2-letter words (1)
oo
3-letter words (8)
oof ooh oom oon oop oor oos oot
4-letter words (16)
oofs oofy oohs ooid ooms oons oont oooo oops oord oory oose oosy oots ooze oozy
5-letter words (15)
oobit oohed oolak oolly oomph oonts oopak ooped oopod oorie ooses ootid oozed oozes oozoa
6-letter words (32)
oobits oocyst oocyte oodles ooecia oofier oogamy oogeny ooglea oogone oohing ooidal oolite oolith oology oolong oomiac oomiak oompah oomphs oopack ooping oorali oorial oorier oosier ootids ootype oozier oozily oozing oozoid
7-letter words (47)
ooblast oocysts oocytes oodlins ooecial ooecium oofbird oofiest oofless ooftish oogloea oogonia oograph oolakan oolemma oolites ooliths oolitic oollies oologic oolongs oomancy oometer oometry oomiack oomiacs oomiaks oompahs oophore oophyte ooplasm ooplast oopodal oopuhue ooralis oorials ooriest ooscope ooscopy oosiest oosperm oospore ootheca ootwith oouassa ooziest oozooid
8-letter words (34)
ooangium oocyesis oocystic oocystis oogamete oogamies oogamous oogenies oogonial oogonium ookinete oolachan oolakans oologies oologist oologize oomantia oometric oomiacks oompahed oomycete oophoric oophoron oophytes oophytic oosperms oosphere oospores oosporic oothecae oothecal ootocoid ootocous ooziness
9-letter words (18)
ooblastic oogametes oogenesis oogenetic oogoninia oogoniums ookinesis ookinetic oolachans oological oologists oomycetes oophoroma ooplasmic oospheres oosporeae oosporous oostegite
10-letter words (9)
oomycetous oophorauxe oophoridia oophoritis oosporange oostegitic oosterbeek ootocoidea oozinesses
11-letter words (10)
oocystaceae oologically oophoralgia oophoridium oophorocele oophoropexy oophorotomy ooporphyrin oosporangia ootocoidean
12-letter words (8)
oocystaceous oogoniophore oophorectomy oophoreocele oophoridiums oophoromania oophorostomy oosporangium
13-letter words (1)
oosporiferous
14-letter words (4)
oophorectomies oophorectomize oophoromalacia oophororrhaphy
15-letter words (2)
oophorectomized oophoroepilepsy
Frequently asked questions
How many words that start with OO are there?
Our word list contains 205 words that start with OO, out of 382,657 entries in total. They run from 2 to 15 letters, and the 7-letter group is the largest with 47 words.
What are the longest words that start with OO?
The longest are oophorectomized (15 letters), oophoroepilepsy (15 letters) and oophorectomies (14 letters).
Which words that start with OO score highest in Scrabble?
By raw letter values, the top scorers on this page are oophorectomized (34 points), oophorectomize (32 points) and oophororrhaphy (30 points) — before any letter or word multipliers. One honest caveat: this list is a broad English word list, so a few rare or technical entries appear that official game dictionaries (and Wordle’s answer list) do not accept. Always check a play against the dictionary your game uses.
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