Words with 'a' at the start and 'tn' at the end

In Scrabble, what's the most points you can get using this list of words beginning with 'a' and ending with 'tn'?
Your only viable choice is 'attn' which totals 4 points.

In total, how many words are there using the combination of letters specified?
On this page of words that start with 'a' and end with 'tn', there is just 1 combination which is available.