5 letter words:
franc10,
furca10,
furan8,
4 letter words:
cauf9,
curf9,
faun7,
faur7,
frau7,
carn6,
cran6,
curn6,
narc6,
raun4,
3 letter words:
arf6,
auf6,
fan6,
far6,
fra6,
fun6,
fur6,
arc5,
can5,
car5,
cru5,
cur5,
ruc5,
nur3,
ran3,
run3,
urn3,
2 letter words:
fa5,
an2,
ar2,
na2,
nu2,
un2,
ur2,