15-Letter Words Matching ___A_T_________

There are 16 15-letter words that match ___A_T_________. 4 are common words, such as BIPARTISANSHIPS and DEPARTMENTALIZE. A rarer one is STRAITLACEDNESS. In this set, I is the most frequent open letter (16 words). 3 words contain a doubled letter.

Full list 16

bipartisanshipsdepartmentalizestraitjacketingunearthlinessesbioastronauticsdepartmentalismdisarticulatingdisarticulationinfantilizationmetastabilitiesmisarticulatingmisattributionsnonantagonisticnonastronomicalromanticizationstraitlacedness

About this list

Words
16 (4 common words)
Common example
bipartisanships
Rare example
straitlacedness
Doubled letters
3
Ending in S
6
Most frequent letter
I (16)

Questions

How many 15-letter words matching ___a_t_________ are there?

16. 4 of them are common words.

What is a common example?

BIPARTISANSHIPS is among the common words in this set.