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object

objective**

observe*

obtain**

obviously*

occasion*

occupation**

occupy**

occur*

ocean*

o’clock

October

odd*

of

off

offer

office

officer

official*

often

oil

OK

old

Olympics

on

once

one

onion**

online

only

onto*

open

opera*

operation*

operator**

opinion*

opponent**

opportunity*

oppose**

opposite

optimistic**

option*

or

orange

orbit**

order

ordinary*

organ**

organic**

organisation*

origin**

original*

other

otherwise*

ought to*

our

ours

ourselves

out

outcome**

outgoing**

outline**

output**

outside

outstanding**

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