6 letter words:
fungus10,
5 letter words:
fugus9,
stung6,
tungs6,
4 letter words:
fugs8,
fugu8,
funs7,
gnus5,
guns5,
gust5,
guts5,
snug5,
sung5,
tugs5,
tung5,
nuts4,
stun4,
tuns4,
3 letter words:
fug7,
fun6,
gnu4,
gun4,
gut4,
tug4,
nus3,
nut3,
sun3,
tun3,
uns3,
uts3,
2 letter words:
nu2,
un2,
us2,
ut2,