5 letter words:
finer8,
infer8,
inner5,
renin5,
4 letter words:
fern7,
fine7,
fire7,
firn7,
heir7,
hern7,
hire7,
neif7,
reif7,
rife7,
nine4,
rein4,
3 letter words:
feh9,
fen6,
fer6,
fie6,
fin6,
fir6,
hen6,
her6,
hie6,
hin6,
ref6,
rif6,
ern3,
inn3,
ire3,
rei3,
rin3,
2 letter words:
ef5,
eh5,
fe5,
he5,
hi5,
if5,
en2,
er2,
in2,
ne2,
re2,