5 letter words:
fiefs11,
fifes11,
fives11,
4 letter words:
effs10,
fief10,
fife10,
five10,
feus7,
fuse7,
seif7,
vies7,
vise7,
3 letter words:
eff9,
iff9,
efs6,
fes6,
feu6,
fie6,
ifs6,
vie6,
vis6,
sei3,
sue3,
use3,
2 letter words:
ef5,
fe5,
if5,
es2,
is2,
si2,
us2,