4 letter words:
fons7,
foss7,
fous7,
funs7,
fuss7,
ufos7,
nous4,
onus4,
sons4,
sous4,
suns4,
3 letter words:
fon6,
fou6,
fun6,
ufo6,
nos3,
nus3,
ons3,
ous3,
son3,
sos3,
sou3,
sun3,
sus3,
uns3,
2 letter words:
of5,
no2,
nu2,
on2,
os2,
ou2,
so2,
un2,
us2,