4 letter words:
afro7,
fair7,
faro7,
faur7,
fiar7,
fora7,
four7,
frau7,
urao4,
3 letter words:
arf6,
auf6,
far6,
fir6,
for6,
fou6,
fra6,
fro6,
fur6,
oaf6,
orf6,
rif6,
ufo6,
air3,
oar3,
ora3,
our3,
rai3,
ria3,
2 letter words:
fa5,
if5,
of5,
ai2,
ar2,
io2,
oi2,
or2,
ou2,
ur2,