According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 11 words with the pattern I--A-A---. That is, nine letter words with 1st letter I and 4th letter A and 6th letter A. In alphabetical order, they are:
imbalance
immanacle
impacable
incapable
incapably
indagated
indagates
indagator
inhalants
inhalator
invadable