15-Letter Words Matching ________N_____N

There are 13 15-letter words that match ________N_____N. 7 are common words, such as DISCONTINUATION and EXPERIMENTATION. A rarer one is SUPERPHENOMENON. In this set, I is the most frequent open letter (12 words). 4 words contain a doubled letter.

Full list 13

discontinuationexperimentationinstrumentationinterconnectionparliamentariansupplementationtransplantationacetophenetidinagribusinessmanagribusinessmencomplementationpreimplantationsuperphenomenon

About this list

Words
13 (7 common words)
Common example
discontinuation
Rare example
superphenomenon
Doubled letters
4
Ending in S
0
Most frequent letter
I (12)

Questions

How many 15-letter words matching ________n_____n are there?

13. 7 of them are common words.

What is a common example?

DISCONTINUATION is among the common words in this set.