13-letter words starting with O
797 words — Scrabble scores shown
There are 797 13-letter words that start with the letter O in our word list. All words are valid in standard English dictionaries and can be used in Scrabble and Words with Friends. The number shown on each word is its Scrabble point value.
2-letter
(19)
3-letter
(91)
4-letter
(201)
5-letter
(334)
6-letter
(705)
7-letter
(1196)
8-letter
(1744)
9-letter
(1892)
10-letter
(1726)
11-letter
(1373)
12-letter
(1021)
13-letter
(797)
14-letter
(598)
15-letter
(403)
- opisthotonoid19
- opportuneless17
- opportuneness17
- opportunistic19
- opportunities17
- oppositionary20
- oppositionism19
- oppositionist17
- oppositipolar19
- oppressionist17
- opprobriating20
- opprobriously22
- opsonotherapy23
- opthalmologic23
- opthalmoplegy26
- opthalmoscopy27
- opticociliary22
- optimizations26
- oraculousness15
- orangeberries16
- orbicularness17
- orbitofrontal18
- orchesography27
- orchestraless18
- orchestrating19
- orchestration18
- orchestrators18
- orchidologist20
- orchidoplasty24
- orchidoptosis21
- orchidotomies21
- orchiectomies22
- orchiomyeloma25
- orchiorrhaphy29
- orderlessness14
- oreotrochilus18
- organicalness16
- organizations23
- organoarsenic16
- organobismuth21
- organogenesis15
- organogenetic17
- organographic22
- organolithium19
- organological17
- organomercury21
- organoplastic18
- organosilicon16
- organotherapy22
- organotrophic21
- organotropism18
- orgiastically19
- orientalizing23
- orientational13
- orientization22
- originalities14
- originatively20
- orismological18
- ornamentalism17
- ornamentalist15
- ornamentality18
- ornamentalize24
- ornamentation15
- ornithichnite21
- ornithischian21
- ornithivorous19
- ornithocopros20
- ornithography25
- ornitholestes16
- ornithologist17
- ornithomantia18
- ornithomantic20
- ornithomyzous30
- ornithophobia23
- ornithopteris18
- ornithosauria16
- ornithoscopic22
- ornithotomist18
- ornithotrophy24
- orobanchaceae22
- oroheliograph22
- oropharyngeal22
- orthagoriscus19
- orthantimonic20
- orthoarsenite16
- orthocarbonic22
- orthocephalic25
- orthoceracone20
- orthoceratite18
- orthoceratoid19
- orthochlorite21
- orthocoumaric22
- orthodiagonal18
- orthodiagraph23
- orthodontists17
- orthodoxality27
- orthoepically23
- orthognathism22
- orthognathous20
- orthogonality20
- orthogonalize26
- orthographies22
- orthographise22
- orthographist22
- orthographize31
- orthohydrogen24
- orthopinacoid21
- orthoplumbate22
- orthopyroxene28
- orthosemidine19
- orthosilicate18
- orthospermous20
- orthostichies21
- orthostichous21
- orthosymmetry26
- orthotolidine17
- orthotoluidin17
- orthovanadate20
- orthoveratric21
- oryctognostic21
- oryzorictinae27
- oscillational15
- oscillatively21
- oscillatorian15
- oscillography24
- oscillometric19
- oscilloscopes19
- oscilloscopic21
- osirification18
- osmodysphoria24
- osphresiology22
- osphromenidae21
- osphyomelitis23
- ossiculectomy22
- ossifications18
- ostariophysan21
- osteanabrosis15
- ostearthritis16
- ostensibility18
- ostensorsoria13
- osteoaneurysm18
- osteoblastoma17
- osteocachetic22
- osteodentinal14
- osteogangrene15
- osteoglossoid15
- osteomalacial17
- osteometrical17
- osteomyelitis18
- osteonecrosis15
- osteopetrosis15
- osteoplasties15
- osteosteatoma15
- ostracization24
- ostreiculture15
- ostreophagist19
- ostreophagous19
- otherwiseness19
- otocerebritis17
- otonecrectomy22
- otopharyngeal22
- outbargaining17
- outboundaries16
- outcompliment21
- outdistancing17
- outequivocate27
- outgeneraling15
- outgeneralled15
- outjourneying24
- outmaneuvered19
- outperforming21
- outpopulating18
- outpracticing20
- outrecuidance18
- outriggerless15
- outsatisfying20
- outsettlement15
- outskirmisher22
- outsparsprued18
- outsparspying21
- outspokenness19
- outstandingly18
- outstretching19
- outtyrannized26
- outvociferate21
- ovariectomize29
- ovariorrhexis26
- ovatopyriform26
- overabounding20
- overabundance21
- overabusively24
- overachieving25
- overactivated22
- overacuteness18
- overaddiction20
- overadornment19
- overadvancing23
- overaggravate21
- overagitating18
- overagitation17