5 letter words:
frust8,
turfs8,
spurt7,
turps7,
4 letter words:
furs7,
fust7,
surf7,
turf7,
purs6,
puts6,
spur6,
tups6,
urps6,
rust4,
ruts4,
3 letter words:
fur6,
pst5,
pur5,
pus5,
put5,
sup5,
tup5,
ups5,
urp5,
rut3,
sur3,
uts3,
2 letter words:
up4,
st2,
ur2,
us2,
ut2,