6 letter words:
fixure16,
5 letter words:
fixer15,
refix15,
4 letter words:
fier7,
fire7,
reif7,
rife7,
iure4,
3 letter words:
fix13,
rex10,
erf6,
fer6,
feu6,
fie6,
fir6,
fur6,
ref6,
rif6,
ire3,
rei3,
rue3,
ure3,
2 letter words:
ex9,
xi9,
xu9,
ef5,
fe5,
if5,
er2,
re2,
ur2,