5 letter words:
frugs9,
frust8,
turfs8,
trugs6,
4 letter words:
frug8,
fugs8,
furs7,
fust7,
surf7,
turf7,
gurs5,
gust5,
guts5,
rugs5,
trug5,
tugs5,
rust4,
ruts4,
3 letter words:
fug7,
fur6,
gur4,
gus4,
gut4,
rug4,
tug4,
ugs4,
rut3,
sur3,
uts3,
2 letter words:
gu3,
ug3,
st2,
ur2,
us2,
ut2,