15-Letter Words Matching A_____N________

There are 13 15-letter words that match A_____N________. 3 are common words, such as ACRIMONIOUSNESS and AERODYNAMICALLY. A rarer one is ANTISENTIMENTAL. In this set, I is the most frequent open letter (13 words). 2 words contain a doubled letter.

Full list 13

acrimoniousnessaerodynamicallyargumentativelyantepenultimateaerodynamicistsalkalinizationsanticonvulsantsanticonvulsivesantimanagementsantimonarchicalantimonarchistsantimonopolistsantisentimental

About this list

Words
13 (3 common words)
Common example
acrimoniousness
Rare example
antisentimental
Doubled letters
2
Ending in S
8
Most frequent letter
I (13)

Questions

How many 15-letter words matching a_____n________ are there?

13. 3 of them are common words.

What is a common example?

ACRIMONIOUSNESS is among the common words in this set.