12-Letter Words Matching N_________C_

There are 20 12-letter words that match N_________C_. 2 are common words, such as NONEXISTENCE and NONNARCOTICS. A rarer one is NONRESIDENCY. In this set, O is the most frequent open letter (19 words). 2 words contain a doubled letter.

Full list 20

nonexistencenonnarcoticsnarcolepticsneurosciencenonadherencenonemergencynonobediencenonoccurencenonresidencenatriureticsneurolepticsnonacademicsnonarchitectnoncandidacynondiabeticsnondomesticsnonelectricsnoninfluencenoninsurancenonresidency

About this list

Words
20 (2 common words)
Common example
nonexistence
Rare example
nonresidency
Doubled letters
2
Ending in S
8
Most frequent letter
O (19)

Questions

How many 12-letter words matching n_________c_ are there?

20. 2 of them are common words.

What is a common example?

NONEXISTENCE is among the common words in this set.