13-Letter Words Matching ___N_S_______

There are 20 13-letter words that match ___N_S_______. 9 are common words, such as BRINKSMANSHIP and EARNESTNESSES. A rarer one is SWINISHNESSES. In this set, I is the most frequent open letter (17 words). 10 words contain a doubled letter.

Full list 20

brinksmanshipearnestnessesgrandstandinggrantsmanshipgymnasticallymannishnessesthanksgivingstransshipmenttransshippinggymnosophistsgymnospermousagonisticallydonnishnessesethnosciencesfaunisticallygrandstandersgymnospermiespianisticallysceneshiftersswinishnesses

About this list

Words
20 (9 common words)
Common example
brinksmanship
Rare example
swinishnesses
Doubled letters
10
Ending in S
11
Most frequent letter
I (17)

Questions

How many 13-letter words matching ___n_s_______ are there?

20. 9 of them are common words.

What is a common example?

BRINKSMANSHIP is among the common words in this set.