8 letter words:
frustums13,
7 letter words:
frustum12,
6 letter words:
frusts9,
strums8,
tussur6,
5 letter words:
frust8,
fusts8,
surfs8,
turfs8,
musts7,
smurs7,
smuts7,
strum7,
stums7,
turms7,
rusts5,
truss5,
4 letter words:
fums9,
furs7,
fuss7,
fust7,
surf7,
turf7,
muss6,
must6,
muts6,
rums6,
smur6,
smut6,
stum6,
sums6,
tums6,
turm6,
rust4,
ruts4,
susu4,
urus4,
utus4,
3 letter words:
fum8,
fur6,
mus5,
mut5,
rum5,
sum5,
tum5,
umu5,
rut3,
sur3,
sus3,
uts3,
utu3,
2 letter words:
mu4,
um4,
st2,
ur2,
us2,
ut2,
