6 letter words:
tiffed13,
5 letter words:
fifed12,
fetid9,
4 letter words:
diff11,
fief10,
fife10,
teff10,
tiff10,
defi8,
deft8,
diet5,
dite5,
edit5,
tide5,
tied5,
3 letter words:
eff9,
iff9,
def7,
dif7,
fed7,
fid7,
eft6,
fet6,
fie6,
fit6,
die4,
dit4,
ted4,
tie3,
2 letter words:
ef5,
fe5,
if5,
de3,
ed3,
id3,
et2,
it2,
ti2,
