7 letter words:
spiffed16,
5 letter words:
spiff13,
diffs12,
fifed12,
fiefs11,
fifes11,
defis9,
siped8,
spied8,
4 letter words:
diff11,
effs10,
fief10,
fife10,
defi8,
difs8,
feds8,
fids8,
dips7,
peds7,
pied7,
seif7,
sped7,
pies6,
sipe6,
dies5,
ides5,
side5,
3 letter words:
eff9,
iff9,
def7,
dif7,
fed7,
fid7,
dip6,
efs6,
fes6,
fie6,
ifs6,
ped6,
pes5,
pie5,
pis5,
psi5,
sip5,
die4,
dis4,
eds4,
ids4,
sei3,
2 letter words:
ef5,
fe5,
if5,
pe4,
pi4,
de3,
ed3,
id3,
es2,
is2,
si2,