13-Letter Words Matching __A_N________

There are 12 13-letter words that match __A_N________. 5 are common words, such as BRAINCHILDREN and BRAINSTORMING. A rarer one is REANNEXATIONS. In this set, S is the most frequent open letter (11 words). 7 words contain a doubled letter.

Full list 12

brainchildrenbrainstormingbrainwashingsdiagnosticianstaunchnessesbrainlessnesslearnednessesplaintivenesstrainspotterstrainspottingbrainstormersreannexations

About this list

Words
12 (5 common words)
Common example
brainchildren
Rare example
reannexations
Doubled letters
7
Ending in S
8
Most frequent letter
S (11)

Questions

How many 13-letter words matching __a_n________ are there?

12. 5 of them are common words.

What is a common example?

BRAINCHILDREN is among the common words in this set.