15-Letter Words Matching ___N__I________

There are 18 15-letter words that match ___N__I________. 6 are common words, such as MAINTAINABILITY and MOUNTAINEERINGS. A rarer one is TRANSPIRATIONAL. In this set, A is the most frequent open letter (18 words). 4 words contain a doubled letter.

Full list 18

maintainabilitymountaineeringstransfigurationtransliteratingtransliterationtransmigrationsfranchisabilitymagnanimousnessprenotificationtranquilizationethnohistoriansethnohistoricalfrenchificationhypnotizabilitymountainousnesstranshistoricaltransmissometertranspirational

About this list

Words
18 (6 common words)
Common example
maintainability
Rare example
transpirational
Doubled letters
4
Ending in S
5
Most frequent letter
A (18)

Questions

How many 15-letter words matching ___n__i________ are there?

18. 6 of them are common words.

What is a common example?

MAINTAINABILITY is among the common words in this set.