5 letter words:
fenis8,
fines8,
neifs8,
niefs8,
nifes8,
4 letter words:
feys10,
feis7,
feni7,
fens7,
fine7,
fins7,
nefs7,
neif7,
nief7,
nife7,
nyes7,
seif7,
snye7,
syen7,
syne7,
yens7,
yins7,
nies4,
sien4,
sine4,
3 letter words:
fey9,
efs6,
fen6,
fes6,
fie6,
fin6,
ifs6,
nef6,
nye6,
nys6,
sey6,
sif6,
sny6,
sye6,
syn6,
yen6,
yes6,
yin6,
ens3,
ins3,
nie3,
nis3,
sei3,
sen3,
sin3,
2 letter words:
fy8,
ef5,
fe5,
if5,
ny5,
ye5,
en2,
es2,
in2,
is2,
ne2,
si2,