15-Letter Words Matching _____N______O__

There are 12 15-letter words that match _____N______O__. 2 are common words, such as AUTHENTICATIONS and NONCONTRIBUTORY. A rarer one is UNDERNUTRITIONS. 3 words contain a doubled letter.

Full list 12

authenticationsnoncontributorymyelencephalonsretransmissionscollenchymatouscommensurationscotransductionsdisconsolationsnonconsumptionspreponderationssupernutritionsundernutritions

About this list

Words
12 (2 common words)
Common example
authentications
Rare example
undernutritions
Doubled letters
3
Ending in S
11

Questions

How many 15-letter words matching _____n______o__ are there?

12. 2 of them are common words.

What is a common example?

AUTHENTICATIONS is among the common words in this set.