5 letter words:
batch12,
botch12,
4 letter words:
bach11,
baht9,
bath9,
both9,
chao9,
chat9,
tach9,
oath7,
boat6,
bota6,
coat6,
taco6,
3 letter words:
bah8,
hob8,
cab7,
cob7,
hao6,
hat6,
hot6,
tho6,
abo5,
act5,
bat5,
boa5,
bot5,
cat5,
cot5,
oba5,
oca5,
tab5,
oat3,
tao3,
2 letter words:
ah5,
ha5,
ho5,
oh5,
ab4,
ba4,
bo4,
at2,
ta2,
to2,