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4-Letter Words with I and O

Need 4-letter words containing both I and O? This list has every option. Popular examples include AGIO, BIOG, BIOS, plus BIRO, BOIL, BRIO and many more. Each word links to its dictionary entry for deeper understanding.

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97 words

Word	Length	Syllables
agio	4	2
biog	4	1
bios	4	1
biro	4	2
boil	4	1
brio	4	1
ciao	4	1
cion	4	1
coif	4	1
coil	4	1
coin	4	1
coir	4	1
coni	4	2
dido	4	2
dino	4	2
diol	4	1
doit	4	1
fico	4	2
fido	4	2
filo	4	2
fino	4	2
foci	4	2
foil	4	1
foin	4	1
giro	4	2
icon	4	2
idol	4	2
ikon	4	2
info	4	2
inro	4	2
into	4	2
ions	4	1
iota	4	2
iron	4	2
jiao	4	1
join	4	1
kilo	4	2
kino	4	2
kois	4	1
koji	4	2
lido	4	2
lilo	4	2
limo	4	2
lino	4	2
lion	4	1
loci	4	2
loid	4	1
loin	4	1
loti	4	2
milo	4	2
miso	4	2
modi	4	2
moil	4	1
momi	4	2
naoi	4	1
nodi	4	2
noil	4	1
noir	4	1
nori	4	2
obia	4	2
obis	4	2
obit	4	2
odic	4	2
ohia	4	2
oils	4	1
oily	4	2
oink	4	1
olio	4	2
omit	4	2
otic	4	2
oxid	4	2
oxim	4	2
pion	4	1
piso	4	2
pois	4	1
riot	4	1
roil	4	1
roti	4	2
silo	4	2
soil	4	1
soli	4	2
sori	4	2
thio	4	1
tiro	4	2
toil	4	1
toit	4	1
topi	4	2
tori	4	2
trio	4	1
vino	4	2
viol	4	1
void	4	1
wino	4	2
yogi	4	2
yoni	4	2
zoic	4	1
zori	4	2

FAQs

How should I pick the next guess?
Favor letters you haven't tested and keep the constraints intact.

Why aren't proper nouns shown?
Proper nouns/abbreviations are generally excluded.

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