6 letter words:
fruits9,
5 letter words:
first8,
frist8,
frits8,
fruit8,
frust8,
rifts8,
turfs8,
4 letter words:
firs7,
fist7,
fits7,
fris7,
frit7,
furs7,
fust7,
rifs7,
rift7,
sift7,
surf7,
turf7,
rits4,
rust4,
ruts4,
stir4,
suit4,
tuis4,
urus4,
utis4,
utus4,
3 letter words:
fir6,
fit6,
fur6,
ifs6,
rif6,
sif6,
its3,
rit3,
rut3,
sir3,
sit3,
sri3,
sui3,
sur3,
tis3,
tui3,
uts3,
utu3,
2 letter words:
if5,
is2,
it2,
si2,
st2,
ti2,
ur2,
us2,
ut2,