15-Letter Words Matching ____N________S_

There are 14 15-letter words that match ____N________S_. 5 are common words, such as ADVENTUROUSNESS and DEFENSELESSNESS. A rarer one is UNCONCERNEDNESS. In this set, N is the most frequent open letter (13 words). 10 words contain a doubled letter.

Full list 14

adventurousnessdefenselessnesshumanitarianismincongruousnessunconsciousnessantinationalistinsensitivenessplainspokennesschronobiologistcolonizationistdomineeringnesspersnicketinesssaponaceousnessunconcernedness

About this list

Words
14 (5 common words)
Common example
adventurousness
Rare example
unconcernedness
Doubled letters
10
Ending in S
10
Most frequent letter
N (13)

Questions

How many 15-letter words matching ____n________s_ are there?

14. 5 of them are common words.

What is a common example?

ADVENTUROUSNESS is among the common words in this set.