According to
SOWPODS (the combination of
Scrabble dictionaries used around the world) there are 12 words with the pattern --BA-A-. That is, seven letter words with 3rd letter B and 4th letter A and 6th letter A. In alphabetical order, they are:
albatas
babalas
cabalas
cabanas
cobaeas
kabakas
kabalas
kabayas
qabalahqabalas
subadar
subalar