15-Letter Words Matching _____O______N__

There are 18 15-letter words that match _____O______N__. 4 are common words, such as CONFRONTATIONAL and DISPROPORTIONAL. A rarer one is THERMOREMANENCE. In this set, R is the most frequent open letter (16 words). 5 words contain a doubled letter.

Full list 18

confrontationaldisproportionalnonprofessionalsubprofessionalovercommitmentsovercomplacencypleuropneumoniapreprofessionaltribromoethanolanticonvulsantsdichloroethanesdisproportionedenterogastronesimmunoblottingsorganochlorinespararosanilinespseudopregnancythermoremanence

About this list

Words
18 (4 common words)
Common example
confrontational
Rare example
thermoremanence
Doubled letters
5
Ending in S
7
Most frequent letter
R (16)

Questions

How many 15-letter words matching _____o______n__ are there?

18. 4 of them are common words.

What is a common example?

CONFRONTATIONAL is among the common words in this set.