5 letter words:
fanum10,
furan8,
unarm7,
4 letter words:
farm9,
faun7,
arum6,
maun6,
mura6,
3 letter words:
arf6,
fan6,
far6,
fun6,
fur6,
amu5,
arm5,
man5,
mar5,
mun5,
nam5,
ram5,
rum5,
ran3,
run3,
urn3,
2 letter words:
fa5,
am4,
ma4,
mu4,
um4,
an2,
ar2,
na2,
nu2,
un2,