5 letter words:
fermi10,
refit8,
merit7,
miter7,
mitre7,
remit7,
timer7,
4 letter words:
firm9,
fire7,
fret7,
frit7,
reft7,
reif7,
rife7,
rift7,
tref7,
emir6,
emit6,
item6,
mire6,
mite6,
rime6,
term6,
time6,
trim6,
rite4,
tier4,
tire4,
3 letter words:
fem8,
eft6,
fer6,
fet6,
fie6,
fir6,
fit6,
ref6,
rif6,
met5,
mir5,
rem5,
rim5,
ire3,
rei3,
ret3,
tie3,
2 letter words:
ef5,
fe5,
if5,
em4,
me4,
mi4,
er2,
et2,
it2,
re2,
ti2,