7 letter words:
firemen12,
fernier10,
refiner10,
6 letter words:
firmer11,
ferine9,
refine9,
refire9,
ermine8,
5 letter words:
fermi10,
finer8,
firer8,
freer8,
frere8,
frier8,
infer8,
refer8,
rifer8,
merer7,
miner7,
rimer7,
4 letter words:
feme9,
firm9,
fere7,
fern7,
fine7,
fire7,
firn7,
free7,
neif7,
reef7,
reif7,
rife7,
emir6,
mere6,
mien6,
mine6,
mire6,
neem6,
rime6,
erne4,
rein4,
3 letter words:
fem8,
fee6,
fen6,
fer6,
fie6,
fin6,
fir6,
ref6,
rif6,
eme5,
men5,
mir5,
nim5,
rem5,
rim5,
ere3,
ern3,
err3,
ire3,
nee3,
ree3,
rei3,
rin3,
2 letter words:
ef5,
fe5,
if5,
em4,
me4,
mi4,
en2,
er2,
in2,
ne2,
re2,