12-Letter Words Matching N_____N_____

There are 14 12-letter words that match N_____N_____. 5 are common words, such as NARROWNESSES and NIGHTINGALES. A rarer one is NONUNANIMOUS. 4 words contain a doubled letter.

Full list 14

narrownessesnightingalesnimblenessesnonagenariannonidenticalnativenessesneuroanatomyneutrinolessnicotinamidenoncognitivenoncountriesnoneconomistnonthinkingsnonunanimous

About this list

Words
14 (5 common words)
Common example
narrownesses
Rare example
nonunanimous
Doubled letters
4
Ending in S
8

Questions

How many 12-letter words matching n_____n_____ are there?

14. 5 of them are common words.

What is a common example?

NARROWNESSES is among the common words in this set.