5 letter words:
miffs13,
muffs13,
4 letter words:
miff12,
muff12,
offs10,
miso6,
sumo6,
3 letter words:
fiz15,
iff9,
off9,
fou6,
ifs6,
ism5,
mis5,
mos5,
mus5,
oms5,
sim5,
som5,
sum5,
sou3,
2 letter words:
if5,
of5,
mi4,
mo4,
mu4,
om4,
um4,
is2,
oi2,
os2,
si2,
so2,
us2,