O

1
oak
2
oasis
3
oath
4
obedience
5
obedient
6
obey
7
object
8
objection
9
objective
10
obligate
11
obligation
12
oblige
13
obliterate
14
obscene
15
obscure
16
observance
17
observant
18
observation
19
observatory
20
observe
21
obsess
22
obstacle
23
obstinate
24
obstruct
25
obstruction
26
obtain
27
obtrude
28
obvious
29
obviously
30
occasion
31
occasional
32
occasionally
33
occupation
34
occupational
35
occupy
36
occur
37
occurrence
38
ocean
39
octave
40
octopus
41
odd
42
odds
43
odometer
44
odor
45
off
46
offend
47
offender
48
offense
49
offensive
50
offer
51
office
52
officer
53
official
54
officially
55
often
56
oil
57
okay
58
old
59
olive
60
Olympus
61
omen
62
omit
63
once
64
one
65
ongoing
66
onion
67
only
68
onward
69
oops
70
open
71
opener
72
opening
73
openly
74
opera
75
operate
76
operation
77
operational
78
operative
79
operator
80
opinion
81
opponent
82
opportune
83
opportunity
84
oppose
85
opposite
86
opposition
87
opt
88
optic
89
optimist
90
option
91
optional
92
oral
93
orange
94
orbit
95
orchard
96
orchestra
97
order
98
orderly
99
ordinary
100
organ
101
organic
102
organisational
103
organism
104
organization
105
organizational
106
organize
107
organizer
108
orientation
109
origami
110
origin
111
original
112
originality
113
originally
114
originate
115
ornament
116
orthodox
117
ostrich
118
other
119
otherwise
120
otter
121
our
122
ours
123
out
124
outbreak
125
outcome
126
outcry
127
outdoor
128
outdoors
129
outer
130
outlaw
131
outlet
132
outline
133
outlook
134
outnumber
135
output
136
outside
137
outsider
138
outstanding
139
outweigh
140
oval
141
oven
142
over
143
overall
144
overcome
145
overdo
146
overdue
147
overestimate
148
overflow
149
overgrown
150
overhead
151
overhear
152
overlook
153
overnight
154
overpower
155
override
156
overrun
157
overseas
158
oversight
159
overstate
160
overtake
161
overthrow
162
overtime
163
overturn
164
overview
165
overweight
166
overwhelm
167
overwhelming
168
overwork
169
owl
170
own
171
owner
172
ownership
173
Oxford
174
oxygen