7 letter words:
hatrack16,
catarrh12,
6 letter words:
chakra15,
charka15,
arrack12,
aarrgh10,
5 letter words:
chark14,
thack14,
track11,
charr10,
chart10,
ratch10,
aargh9,
garth9,
karat9,
arhat8,
carat7,
4 letter words:
hack13,
hark11,
khat11,
cark10,
rack10,
tack10,
arch9,
char9,
chat9,
tach9,
agha8,
arak8,
ghat8,
kart8,
kata8,
taka8,
crag7,
haar7,
hart7,
rath7,
tahr7,
acta6,
carr6,
cart6,
agar5,
grat5,
raga5,
3 letter words:
ark7,
hag7,
kat7,
aah6,
aha6,
hat6,
rah6,
act5,
arc5,
car5,
cat5,
aga4,
gar4,
gat4,
rag4,
tag4,
art3,
rat3,
tar3,
2 letter words:
ka6,
ah5,
ha5,
ag3,
aa2,
ar2,
at2,
ta2,