12-Letter Words Matching ________O_N_

There are 15 12-letter words that match ________O_N_. 3 are common words, such as BATTLEGROUND and COUNTERPOINT. A rarer one is THEATERGOING. In this set, I is the most frequent open letter (13 words). 4 words contain a doubled letter.

Full list 15

battlegroundcounterpointthistledownsbastinadoingvinegarroonsbarricadoingcarbonadoingconcertgoingcrescendoingfluegelhornslamellicornsmanifestoingoverdiscountsuperheroinetheatergoing

About this list

Words
15 (3 common words)
Common example
battleground
Rare example
theatergoing
Doubled letters
4
Ending in S
4
Most frequent letter
I (13)

Questions

How many 12-letter words matching ________o_n_ are there?

15. 3 of them are common words.

What is a common example?

BATTLEGROUND is among the common words in this set.