Words that start with 'abt' and contain 'a'

What's the biggest word you can create from words that start with 'abt' and include 'a'?
The word 'abterminal' is made up of 10 characters.

What is the highest scoring word you can play in Scrabble ?
From this combination of letters, the best word to play is 'abthain' scoring 12 points.

In total, how many words are there using these specific combinations of letters?
In total, you'll find 5 words.