5 letter words:
gruff12,
furan8,
4 letter words:
gaff11,
guff11,
naff10,
raff10,
ruff10,
fang8,
frag8,
frug8,
faun7,
gaun5,
gaur5,
gnar5,
gran5,
guan5,
guar5,
rang5,
ruga5,
rung5,
3 letter words:
aff9,
fag7,
fug7,
arf6,
fan6,
far6,
fun6,
fur6,
gan4,
gar4,
gnu4,
gun4,
nag4,
rag4,
rug4,
ran3,
run3,
urn3,
2 letter words:
fa5,
ag3,
an2,
ar2,
na2,
nu2,
un2,