15-letter words starting with O

Are you looking for 15-letter words that start with O that you can play in Scrabble? The list below contains 257 words that are fifteen letters long, starting with O.

You can also find words of different lengths that start in O by using the links below. We have words in our dictionary ranging from 2-15 letters in length.

Find more words by length

2 3 4 5 6 7 8 9 10 11 12 13 14 15
Word Points US Intl.
1 OBJECTIFICATION 31
2 OBJECTIVENESSES 29
3 OBLIVIOUSNESSES 20
4 OBNOXIOUSNESSES 24
5 OBSERVABILITIES 22
6 OBSERVATIONALLY 23
7 OBSESSIVENESSES 20
8 OBSTINATENESSES 17
9 OBSTRUCTIONALLY 22
10 OBSTRUCTIONISMS 21
11 OBSTRUCTIONISTS 19
12 OBSTRUCTIVENESS 22
13 OBTAINABILITIES 19
14 OBTRUSIVENESSES 20
15 OCCASIONALITIES 19
16 OCCIDENTALISING 21
17 OCCIDENTALIZING 30
18 OCCLUSIVENESSES 22
19 OCEANOGRAPHICAL 25
20 OCHLOCRATICALLY 27
21 OCTOCENTENARIES 19
22 ODONTORHYNCHOUS 27
23 ODONTOSTOMATOUS 18
24 ODORIFEROUSNESS 19
25 OESOPHAGOSCOPES 25
26 OESTROGENICALLY 21
27 OFFENSIVENESSES 24
28 OFFHANDEDNESSES 26
29 OFFICIOUSNESSES 23
30 OLIGOCYTHAEMIAS 26
31 OLIGODENDROCYTE 23
32 OLIGODENDROGLIA 19
33 OLIGOMERISATION 18
34 OLIGOMERIZATION 27
35 OLIGONUCLEOTIDE 19
36 OLIGOSACCHARIDE 24
37 OMNIBENEVOLENCE 24
38 OMNICOMPETENCES 25
39 OMNIDIRECTIONAL 20
40 OMNIFARIOUSNESS 20
41 OMNISEXUALITIES 24
42 OMOPLATOSCOPIES 23
43 ONCOGENETICISTS 20
44 ONEIROCRITICISM 21
45 ONTOGENETICALLY 21
46 ONYCHOCRYPTOSES 30
47 ONYCHOCRYPTOSIS 30
48 OOPHORECTOMISED 25
49 OOPHORECTOMISES 24
50 OOPHORECTOMIZED 34
51 OOPHORECTOMIZES 33
52 OPENHEARTEDNESS 21
53 OPENMOUTHEDNESS 23
54 OPERATIONALISMS 19
55 OPERATIONALISTS 17
56 OPERATIVENESSES 20
57 OPHTHALMOLOGIES 26
58 OPHTHALMOLOGIST 26
59 OPHTHALMOMETERS 27
60 OPHTHALMOPHOBIA 32
61 OPHTHALMOPLEGIA 28
62 OPHTHALMOSCOPES 29
63 OPHTHALMOSCOPIC 31
64 OPINIONATEDNESS 18
65 OPISTHOGNATHISM 26
66 OPISTHOGNATHOUS 24
67 OPISTHOGRAPHIES 26
68 OPPORTUNENESSES 19
69 OPPROBRIOUSNESS 21
70 OPSONIFICATIONS 22
71 OPTIMALISATIONS 19
72 OPTIMALIZATIONS 28
73 OPTOELECTRONICS 21
74 ORACULOUSNESSES 17
75 ORCHESOGRAPHIES 26
76 ORCHESTRATIONAL 20
77 OREOGRAPHICALLY 26
78 ORGANOCHLORINES 21
79 ORGANOGRAPHICAL 24
80 ORGANOGRAPHISTS 22
81 ORGANOMERCURIAL 20
82 ORGANOMETALLICS 20
83 ORGANOPHOSPHATE 26
84 ORGANOTHERAPIES 21
85 ORIENTALIZATION 24
86 ORIENTATIONALLY 18
87 ORNITHODELPHIAN 24
88 ORNITHODELPHOUS 24
89 ORNITHORHYNCHUS 29
90 ORTHOCHROMATISM 27
91 ORTHODONTICALLY 24
92 ORTHOGONALISING 20
93 ORTHOGONALITIES 19
94 ORTHOGONALIZING 29
95 ORTHOPAEDICALLY 26
96 ORTHOPHOSPHATES 28
97 ORTHOPHOSPHORIC 30
98 ORTHOPSYCHIATRY 31
99 OSCILLOGRAPHIES 23
100 OSMOREGULATIONS 18
101 OSTENSIBILITIES 17
102 OSTEOARTHRITICS 20
103 OSTEOMYELITIDES 21
104 OSTEOMYELITISES 20
105 OSTEOPATHICALLY 25
106 OSTREICULTURIST 17
107 OTHERWORLDLIEST 22
108 OUTDOORSMANSHIP 23
109 OUTMANIPULATING 20
110 OUTSPOKENNESSES 21
111 OVERABSTRACTING 23
112 OVERABSTRACTION 22
113 OVERACCENTUATED 23
114 OVERACCENTUATES 22
115 OVERACHIEVEMENT 28
116 OVERADJUSTMENTS 28
117 OVERADVERTISING 23
118 OVERADVERTIZING 32
119 OVERALERTNESSES 18
120 OVERAMBITIOUSLY 25
121 OVERAPPLICATION 24
122 OVERARTICULATED 21
123 OVERARTICULATES 20
124 OVERASSESSMENTS 20
125 OVERBEARINGNESS 21
126 OVERCAPITALISED 23
127 OVERCAPITALISES 22
128 OVERCAPITALIZED 32
129 OVERCAPITALIZES 31
130 OVERCENTRALISED 21
131 OVERCENTRALISES 20
132 OVERCENTRALIZED 30
133 OVERCENTRALIZES 29
134 OVERCLASSIFYING 27
135 OVERCOMMITMENTS 26
136 OVERCOMMUNICATE 26
137 OVERCOMPENSATED 25
138 OVERCOMPENSATES 24
139 OVERCOMPLIANCES 26
140 OVERCOMPLICATED 27
141 OVERCOMPLICATES 26
142 OVERCOMPRESSING 25
143 OVERCONFIDENCES 26
144 OVERCONFIDENTLY 27
145 OVERCONSTRUCTED 23
146 OVERCONSUMPTION 24
147 OVERCONTROLLING 21
148 OVERCORRECTIONS 22
149 OVERCREDULITIES 21
150 OVERCULTIVATION 23
151 OVERDECORATIONS 21
152 OVERDEPENDENCES 24
153 OVERDEVELOPMENT 26
154 OVERDISCOUNTING 22
155 OVERDIVERSIFIED 26
156 OVERDIVERSITIES 22
157 OVERDOCUMENTING 24
158 OVERDRAMATISING 22
159 OVERDRAMATIZING 31
160 OVEREAGERNESSES 19
161 OVEREARNESTNESS 18
162 OVERELABORATING 21
163 OVERELABORATION 20
164 OVEREMBELLISHED 26
165 OVEREMBELLISHES 25
166 OVEREMOTIONALLY 23
167 OVEREMPHASISING 26
168 OVEREMPHASIZING 35
169 OVEREMPLOYMENTS 27
170 OVERENCOURAGING 22
171 OVERENGINEERING 20
172 OVERENTERTAINED 19
173 OVERENTHUSIASMS 23
174 OVERESTIMATIONS 20
175 OVEREVALUATIONS 21
176 OVEREXAGGERATED 28
177 OVEREXAGGERATES 27
178 OVEREXCITEMENTS 29
179 OVEREXPECTATION 29
180 OVEREXTRACTIONS 27
181 OVEREXTRAPOLATE 27
182 OVEREXTRAVAGANT 29
183 OVEREXUBERANTLY 30
184 OVERFAMILIARITY 26
185 OVERFERTILISING 22
186 OVERFERTILIZING 31
187 OVERFLOURISHING 25
188 OVERFORWARDNESS 25
189 OVERFULFILLMENT 26
190 OVERGENERALISED 20
191 OVERGENERALISES 19
192 OVERGENERALIZED 29
193 OVERGENERALIZES 28
194 OVERGLAMORISING 22
195 OVERGLAMORIZING 31
196 OVERGLAMOURIZED 31
197 OVERGLAMOURIZES 30
198 OVERHASTINESSES 21
199 OVERHOMOGENISED 25
200 OVERHOMOGENISES 24
201 OVERHOMOGENIZED 34
202 OVERHOMOGENIZES 33
203 OVERIDENTIFYING 26
204 OVERIMAGINATIVE 24
205 OVERINDULGENCES 22
206 OVERINGENUITIES 19
207 OVERINTENSITIES 18
208 OVERINTERPRETED 21
209 OVERINVESTMENTS 23
210 OVERLENGTHENING 23
211 OVERMANAGEMENTS 23
212 OVERMEDICATIONS 23
213 OVERMULTIPLYING 26
214 OVERMULTITUDING 22
215 OVERNOURISHMENT 23
216 OVEROPINIONATED 21
217 OVERORCHESTRATE 23
218 OVERORNAMENTING 21
219 OVERPERSUASIONS 20
220 OVERPESSIMISTIC 24
221 OVERPOPULATIONS 22
222 OVERPREDICTIONS 23
223 OVERPREPARATION 22
224 OVERPRESCRIBING 25
225 OVERPRODUCTIONS 23
226 OVERPROGRAMMING 26
227 OVERPROPORTIONS 22
228 OVERPROTECTIONS 22
229 OVERREFINEMENTS 23
230 OVERREGULATIONS 19
231 OVERREPRESENTED 21
232 OVERSATURATIONS 18
233 OVERSENSITIVITY 24
234 OVERSIMPLIFYING 29
235 OVERSPECIALISED 23
236 OVERSPECIALISES 22
237 OVERSPECIALIZED 32
238 OVERSPECIALIZES 31
239 OVERSPECULATING 23
240 OVERSPECULATION 22
241 OVERSTABILITIES 20
242 OVERSTIMULATING 21
243 OVERSTIMULATION 20
244 OVERSTRUCTURING 21
245 OVERSUBSCRIBING 25
246 OVERSWEETNESSES 21
247 OVERUTILISATION 18
248 OVERUTILIZATION 27
249 OVERWEENINGNESS 22
250 OVERWITHHOLDING 29
251 OVERZEALOUSNESS 27
252 OVOVIVIPARITIES 26
253 OVOVIVIPAROUSLY 29
254 OXIDOREDUCTASES 26
255 OXYHAEMOGLOBINS 33
256 OXYPHENBUTAZONE 41
257 OXYTETRACYCLINE 32

Scrabble score table

The table below covers how many points each letter will give you when playing a game of Scrabble. The most common letters are worth one point, and the rarest letters are worth 8-10 points.

You can use our Scrabble tools to help you learn and remember words which contain the rare letters to make sure you get the highest score possible!

Score Letters
1 AEIOULNRST
2 DG
3 BCMP
4 FHVWY
5 K
8 JX
10 QZ

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  • "15-letter words starting with O". WordSquared.com. Accessed on October 3, 2022. https://wordsquared.com/scrabble/fifteen-letter-words-starting-with-o/.

  • "15-letter words starting with O". WordSquared.com, https://wordsquared.com/scrabble/fifteen-letter-words-starting-with-o/. Accessed 3 October, 2022

  • 15-letter words starting with O. WordSquared.com. Retrieved from https://wordsquared.com/scrabble/fifteen-letter-words-starting-with-o/.