12-Letter Words Matching _________E_R

There are 12 12-letter words that match _________E_R. 2 are common words, such as ENTREPRENEUR and RESTAURATEUR. A rarer one is PHOTONUCLEAR. In this set, N is the most frequent open letter (11 words). 3 words contain a doubled letter.

Full list 12

entrepreneurrestaurateurcarillonneurextranuclearinternuclearintranuclearintrapreneurmultinuclearmacronuclearnoncollinearoverengineerphotonuclear

About this list

Words
12 (2 common words)
Common example
entrepreneur
Rare example
photonuclear
Doubled letters
3
Ending in S
0
Most frequent letter
N (11)

Questions

How many 12-letter words matching _________e_r are there?

12. 2 of them are common words.

What is a common example?

ENTREPRENEUR is among the common words in this set.