15-Letter Words Matching ____N_____N____

There are 12 15-letter words that match ____N_____N____. 5 are common words, such as INCONSEQUENTIAL and INCONSISTENCIES. A rarer one is ORIENTATIONALLY. In this set, I is the most frequent open letter (12 words). 5 words contain a doubled letter.

Full list 12

inconsequentialinconsistenciesinconveniencingnoninterventionunconditionallydimenhydrinatesplainspokennessprointerventionimmunodiagnosesimmunodiagnosisinconvenienciesorientationally

About this list

Words
12 (5 common words)
Common example
inconsequential
Rare example
orientationally
Doubled letters
5
Ending in S
6
Most frequent letter
I (12)

Questions

How many 15-letter words matching ____n_____n____ are there?

12. 5 of them are common words.

What is a common example?

INCONSEQUENTIAL is among the common words in this set.