12-Letter Words Matching ________O__N

There are 24 12-letter words that match ________O__N. 11 are common words, such as COUNCILWOMAN and COUNCILWOMEN. A rarer one is TETRODOTOXIN. In this set, R is the most frequent open letter (20 words). 2 words contain a doubled letter.

Full list 24

councilwomancouncilwomencountrywomancountrywomenhallucinogenlaundrywomanlaundrywomenservicewomanservicewomenworkingwomanworkingwomenagglutinogenfrankalmoigngonadotropinparahydrogenantiestrogencocarcinogencochairwomancochairwomenhalterbrokenonychophoranpogonophoransomatotropintetrodotoxin

About this list

Words
24 (11 common words)
Common example
councilwoman
Rare example
tetrodotoxin
Doubled letters
2
Ending in S
0
Most frequent letter
R (20)

Questions

How many 12-letter words matching ________o__n are there?

24. 11 of them are common words.

What is a common example?

COUNCILWOMAN is among the common words in this set.