7 letter words:
fossils10,
6 letter words:
fossil9,
5 letter words:
filos8,
floss8,
foils8,
silos5,
soils5,
4 letter words:
filo7,
fils7,
foil7,
foss7,
isos4,
loss4,
oils4,
silo4,
siss4,
soil4,
soli4,
sols4,
soss4,
3 letter words:
fil6,
ifs6,
sif6,
ios3,
iso3,
lis3,
los3,
oil3,
sis3,
sol3,
sos3,
2 letter words:
if5,
of5,
io2,
is2,
li2,
lo2,
oi2,
os2,
si2,
so2,