oaf 1  
oak tree 1  
oak 1  
oar 1  
oasis 1  
oath 1   2  
oats 1  
obedience 1  
obedient 1  
obese 1  
obesity 1  
obey (to -) 1  
obituary notice 1  
object (to -) 1   2  
object 1   2  
objection 1   2   3   4  
objective 1   2  
objector 1  
obligation 1   2   3   4  
obligatory 1  
oblige (to -) 1  
obliged 1   2  
obliging 1   2  
oblique 1   2   3  
oblong 1   2  
obnoxious 1  
oboe 1  
obscene language 1  
obscene 1   2  
obscenity 1   2   3  
obscure (to -) 1   2  
obscure 1  
obscuring 1  
obsequious 1   2  
observance 1   2  
observant 1   2  
observation 1   2  
observatory 1  
observe (to -) 1   2   3  
observed (not -) 1  
observer 1  
obsess (to -) 1  
obsessing 1  
obsession 1   2   3   4  
obsolete 1  
obstacle 1   2   3   4   5  
obstetric 1  
obstetrician 1  
obstinacy 1   2  
obstinate 1   2   3   4   5  
obstruct (to -) 1   2   3   4   5   6   7   8   9  
obstructed (to become -) 1  
obstruction 1   2   3  
obtain (to -) 1   2   3  
obtain a diploma (to -) 1  
obtuse 1  
obviate (to -) 1  
obvious 1   2   3   4  
obviousness 1  
occasion 1   2   3  
occasional contributor 1  
occasional 1   2   3  
occiput 1  
occlusion 1  
occult 1  
occupation 1   2  
occupied 1  
occupy (to -) 1  
occur (to -) 1   2   3  
occurrence 1  
ocean 1  
ocelot 1  
ochre 1  
octahedron 1  
octagon 1  
octagonal 1  
octane 1  
octant 1  
octave 1  
October 1  
octopus 1   2  
ocular 1  
oculist 1  
odd 1   2   3   4   5   6   7   8   9   10  
ode 1  
odious 1  
odourless 1  
odyssey 1  
of 1   2   3   4  
off-key 1  
off-putting 1  
off-road vehicle 1  
off-the-record 1  
off colour 1  
off 1   2  
offence 1   2   3   4   5  
offend (to -) 1  
offend gravely (to -) 1  
offended 1  
offender 1   2   3  
offensive weapon 1  
offensive 1   2  
offer (to -) 1   2   3  
offer 1  
offering 1  
office boy 1  
office data processing 1  
office of secretary 1  
office promises 1  
office 1   2   3   4   5   6   7  
officer 1  
official (to make -) 1  
Official Gazette 1  
official 1   2   3  
officially recognized 1  
offside 1  
offspring 1  
often 1  
ogre 1  
oh dear 1  
oh 1  
oil-bearing 1  
oil-lamp 1  
oil (to -) 1   2  
oil and vinegar cruet 1  
oil filter 1  
oil paints 1  
oil pipeline 1  
oil sump 1  
oil tanker 1  
oil 1   2   3  
oilman 1  
oilskins 1  
oily 1   2   3   4  
ointment 1   2  
okapi 1  
old-fashioned 1   2  
old age 1   2  
old fashioned 1  
old man 1  
old people's home 1  
old person 1  
old 1   2   3  
older 1  
oldest 1  
oleander 1  
oliguria 1  
olive grove 1  
olive oil 1  
olive tree 1  
olive 1   2  
Olympic games 1  
Olympic 1  
omelette 1  
omen 1   2   3  
omission 1  
omit (to -) 1   2   3  
on-off strike 1  
on-the-spot investigation 1  
on to 1  
on 1   2   3   4   5   6   7  
once (at -) 1   2  
once again 1  
once in a while 1  
once 1   2  
oncogene 1  
oncologist 1  
oncology 1  
one's 1  
one-man show 1  
one-party government 1  
one-room flat 1  
one-sided 1  
one-to-one 1  
one-way street 1  
one (no -) 1  
one (the -) 1   2  
one another 1   2  
one in a thousand 1  
one of the best (to be -) 1  
one side (to -) 1  
one 1   2  
onerous 1   2  
oneself 1   2   3  
onion 1  
onlooker 1  
only 1   2   3   4   5  
onslaught 1  
onto 1  
onyx 1  
ooze (to -) 1   2  
opal 1  
opaque 1  
open (to -) 1   2   3   4   5   6  
open air (in the -) 1  
open on/onto (to -) 1  
open one's eyes wide (to -) 1   2  
open sea 1  
open space 1  
open to appeal (not -) 1  
open wide (to -) 1   2  
open 1   2  
opening 1   2   3   4   5   6   7  
openness 1  
opera house 1  
opera singer 1  
opera 1   2  
operate (to -) 1   2   3   4  
operating 1   2  
operation 1   2  
operational 1   2  
operative 1  
operator 1   2  
operculum 1  
operetta 1  
ophthalmologist 1  
opinion (in my -) 1  
opinion poll 1  
opinion 1   2   3   4   5   6   7  
opium 1  
opponent 1   2   3   4   5  
opportune 1  
opportuneness 1  
opportunist 1  
opportunity 1   2   3   4  
oppose (to -) 1   2   3   4  
opposed to (to be -) 1  
opposed 1   2   3  
opposer 1  
opposing 1   2   3  
opposite direction (in the -) 1  
opposite party 1  
opposite 1   2   3   4   5   6  
opposition 1  
oppress (to -) 1  
oppression 1  
oppressive 1   2  
oppressor 1  
opt (to -) 1  
optical character reader 1  
optical 1  
optician 1  
optics 1  
optimism 1  
optimist 1  
optimize (to -) 1  
optimum 1  
option 1  
optional 1  
–or  spesso corrisponde all'italiano –ore  (creator)
or 1   2   3   4   5  
oracle 1  
oral test 1  
oral 1   2  
orange drink 1  
orange grove 1  
orange tree 1  
orange 1   2   3  
orangeade 1  
oration 1  
orator 1  
oratorical 1  
oratory 1  
orbit 1  
orca 1  
orchard 1  
orchestra 1  
orchestrate (to -) 1  
orchid 1  
orchitis 1  
order (in -) 1   2   3  
order (to -) 1   2   3   4  
order that (in -) 1   2  
order to so as to (in -) 1  
order (total, partial, well, magnitude, …) 1  
order 1   2   3   4   5   6   7   8   9   10   11  
orderly 1   2   3   4  
ordinal 1  
ordinary 1   2   3   4  
ordinate 1  
ordination 1  
ore 1   2  
oregano 1  
organ 1  
organic 1  
organism 1  
organization chart 1  
organization 1  
organize (to -) 1  
organizer 1   2  
organizing 1  
orgasm 1  
orgy 1  
orient (to -) 1  
oriental 1  
orientation 1  
orifice 1   1  
origin 1   2  
original 1   2  
originality 1  
ornale) to subscribe 1  
ornament 1   2   3  
ornamental 1   2  
ornate 1  
ornithology 1  
orphan 1  
orphanage 1  
orthocenter 1  
orthodox 1  
orthogonal 1  
orthopaedic specialist 1  
orthopaedic 1  
orthopaedics 1  
orthopaedist 1  
oscillation 1  
oscillometer 1  
osculating 1  
oscured (to be -) 1  
osseous 1  
ostentation 1  
ostentatious 1  
osteomalacia 1  
osteomyelitis 1  
osteoporosis 1  
ostrich 1  
others 1   2  
otherwise 1   2   3  
otitis 1  
otosclerosis 1  
otter 1  
ought to 1  
ounce 1  
our family 1  
Our lady 1  
our own 1  
our 1  
ours 1  
ourselves 1   2  
–ous  spesso corrisponde all'italiano –oso  (famous)
oust (to -) 1   2   3  
out–  spesso corrisponde all'italiano stra–  (outdo)
out-of-date 1   2  
out-of-the-way 1  
out of danger 1  
out of focus 1  
out of it 1  
out of order 1   2  
out of place (to be -) 1  
out of place 1  
out of print 1  
out of proportion 1  
out of stock 1  
out of the blue 1  
out of the ordinary 1  
out of the way 1   2  
out of there 1  
out of tune 1   2  
out of work 1  
out of 1   2   3   4  
out 1   2   3  
outboard motor 1  
outburst 1   2   3   4   5   6  
outcast 1  
outclass (to -) 1  
outcome 1   2   3   4  
outdistance (to -) 1  
outdo (to -) 1   2   3  
outdoors 1  
outflow 1  
outgo 1  
outlaw 1  
outlet 1   2  
outlier 1   2   3  
outline (to -) 1   2   3   4   5   6  
outline agreement 1  
outline 1   2   3   4   5   6   7  
outlines 1  
outlive (to -) 1  
outnumber (to -) 1  
outpatients' department 1  
output 1   2   3  
outrage (to -) 1  
outrage 1   2  
outrageous 1  
outrigger canoe 1  
outrigger 1  
outside 1   2  
outsider 1  
outskirts 1   2  
outstanding business 1  
outstanding payment 1  
outstanding 1   2   3  
outstretched 1  
outward journey 1  
outward 1  
outwards 1  
oval 1  
ovary 1   2  
ovation 1  
oven-proof dish 1  
oven 1  
over–  spesso corrisponde all'italiano sovra–  (overweight)
over-medication 1  
over-simplified 1  
over (to go all -) 1  
over again 1  
over there 1   2   3  
over 1   2   3  
overabundant 1  
overall view 1  
overall 1   2   3  
overalls 1  
overbalance (to -) 1  
overbar (to -) 1  
overbearing 1   2  
overburdened 1  
overcast (to become -) 1  
overcast 1   2   3  
overcoat 1   2  
overcome (to -) 1   2   3   4   5  
overcome 1   2  
overcooked 1   2  
overcrowded 1  
overcrowding 1  
overdo things (to -) 1   2  
overdone 1   2  
overdrawn 1  
overestimate (to -) 1   2  
overflow (to -) 1   2  
overflow 1  
overhanging rock 1  
overhanging 1  
overhaul (to -) 1  
overhaul 1  
overhead projector 1  
overheat (to -) 1  
overlap (to -) 1  
overline (to -) 1  
overload (to -) 1  
overload 1  
overloaded 1   2  
overlooking 1  
overnight stay 1  
overpass 1  
overpay (to -) 1  
overpowering 1  
overrate (to -) 1  
overrun (to -) 1  
overscore (to -) 1  
overseas 1  
oversee (to -) 1  
overseer 1  
oversentimental 1  
overshadow (to -) 1  
oversight 1   2   3  
overtake (to -) 1   2  
overtaking 1  
overthrow (to -) 1  
overtime 1  
overturn (to -) 1   2   3   4  
overuse 1  
overwhelm (to -) 1   2  
overwhelm with (to -) 1  
overwhelming 1   2  
overwork (to -) 1  
overwork 1  
ovine 1  
ovulation 1  
ovum 1  
ow 1  
owing to 1  
owl 1   2  
own (to -) 1  
own goal 1   2  
owner 1   2   3  
ownership 1  
ox 1  
oxide 1  
oxidize (to -) 1  
oxygen 1  
oxygenate (to -) 1  
oxyhydrogen 1  
oyster 1  
ozone 1