14-Letter Words Matching __N_N_________

There are 20 14-letter words that match __N_N_________. 2 are common words, such as NONENFORCEABLE and NONINDEPENDENT. A rarer one is NONINVOLVEMENT. In this set, O is the most frequent open letter (20 words). 3 words contain a doubled letter.

Full list 20

nonenforceablenonindependentgynandromorphsnonenforcementnoninflammablenoninformativenoninhabitablenoninstinctivenonintercourseranunculaceousgynandromorphymononucleotidenonantibioticsnonengagementsnonengineeringnoninformationnoninstallmentnoninteractingnoninteractivenoninvolvement

About this list

Words
20 (2 common words)
Common example
nonenforceable
Rare example
noninvolvement
Doubled letters
3
Ending in S
4
Most frequent letter
O (20)

Questions

How many 14-letter words matching __n_n_________ are there?

20. 2 of them are common words.

What is a common example?

NONENFORCEABLE is among the common words in this set.