10 letter words:
preferring16,
9 letter words:
referring13,
8 letter words:
fingerer12,
inferrer11,
peregrin11,
7 letter words:
prefire12,
feigner11,
freeing11,
reefing11,
fernier10,
peering10,
preeing10,
refiner10,
repiner9,
ripener9,
6 letter words:
prefer11,
feeing10,
finger10,
fringe10,
ferine9,
griper9,
peeing9,
pinger9,
refine9,
refire9,
repine8,
erring7,
ringer7,
5 letter words:
feign9,
grief9,
finer8,
firer8,
freer8,
frere8,
frier8,
genip8,
gripe8,
infer8,
refer8,
repeg8,
rifer8,
preen7,
prier7,
repin7,
ripen7,
riper7,
genie6,
genre6,
green6,
reign6,
renig6,
rerig6,
4 letter words:
frig8,
fere7,
fern7,
fine7,
fire7,
firn7,
free7,
grip7,
neif7,
ping7,
prig7,
reef7,
reif7,
rife7,
neep6,
peen6,
peer6,
pein6,
pere6,
peri6,
pier6,
pine6,
pirn6,
pree6,
ripe6,
eger5,
gene5,
gien5,
girn5,
gree5,
grin5,
ring5,
erne4,
rein4,
3 letter words:
fig7,
fee6,
fen6,
fer6,
fie6,
fin6,
fir6,
gip6,
peg6,
pig6,
ref6,
rif6,
nip5,
pee5,
pen5,
per5,
pie5,
pin5,
rep5,
rip5,
eng4,
erg4,
gee4,
gen4,
gie4,
gin4,
neg4,
reg4,
rig4,
ere3,
ern3,
err3,
ire3,
nee3,
ree3,
rei3,
rin3,
2 letter words:
ef5,
fe5,
if5,
pe4,
pi4,
en2,
er2,
in2,
ne2,
re2,