6 letter words:
knacks16,
5 letter words:
knack15,
skank13,
skunk13,
snack11,
snuck11,
ankus9,
uncus7,
unaus5,
4 letter words:
cask10,
cusk10,
sack10,
suck10,
auks8,
kuna8,
sank8,
skua8,
sunk8,
cans6,
scan6,
anus4,
unau4,
3 letter words:
ask7,
auk7,
kas7,
ska7,
suk7,
can5,
sac5,
nus3,
sau3,
sun3,
uns3,
2 letter words:
ka6,
an2,
as2,
na2,
nu2,
un2,
us2,