6 letter words:
filler9,
fuller9,
ireful9,
refill9,
5 letter words:
filer8,
fille8,
flier8,
frill8,
lifer8,
rifle8,
iller5,
rille5,
4 letter words:
fell7,
file7,
fill7,
fire7,
flir7,
flue7,
fuel7,
full7,
furl7,
lief7,
life7,
reif7,
rife7,
lier4,
lieu4,
lire4,
lure4,
riel4,
rile4,
rill4,
rule4,
3 letter words:
elf6,
fer6,
feu6,
fie6,
fil6,
fir6,
flu6,
fur6,
ref6,
rif6,
ell3,
ill3,
ire3,
lei3,
leu3,
lie3,
rei3,
rue3,
2 letter words:
ef5,
fe5,
if5,
el2,
er2,
li2,
re2,