15-Letter Words Matching ___N________N__

There are 16 15-letter words that match ___N________N__. 2 are common words, such as ACKNOWLEDGMENTS and MOUNTAINEERINGS. A rarer one is TRANSPOSITIONAL. 3 words contain a doubled letter.

Full list 16

acknowledgmentsmountaineeringscountercurrentsmalnourishmentstranscriptionalcounterevidencecounterinstancecounterresponsecountershadingscountertendencycounterviolencephenobarbitonesphenylbutazonespronunciationaltranspirationaltranspositional

About this list

Words
16 (2 common words)
Common example
acknowledgments
Rare example
transpositional
Doubled letters
3
Ending in S
7

Questions

How many 15-letter words matching ___n________n__ are there?

16. 2 of them are common words.

What is a common example?

ACKNOWLEDGMENTS is among the common words in this set.