13-Letter Words Matching _____O_N_____

There are 17 13-letter words that match _____O_N_____. 8 are common words, such as MILLIONNAIRES and PHYSIOGNOMIES. A rarer one is TYPEFOUNDINGS. In this set, E is the most frequent open letter (14 words). 8 words contain a doubled letter.

Full list 17

millionnairesphysiognomiespsychoanalystpsychoanalyzereappointmentshallownessesunaccountableunaccountablygastrocnemiuspoltrooneriesbackcountriesdumbfounderedeasygoingnessparamountciesreencounteredrockhoundingstypefoundings

About this list

Words
17 (8 common words)
Common example
millionnaires
Rare example
typefoundings
Doubled letters
8
Ending in S
10
Most frequent letter
E (14)

Questions

How many 13-letter words matching _____o_n_____ are there?

17. 8 of them are common words.

What is a common example?

MILLIONNAIRES is among the common words in this set.