13-Letter Words Matching _____O____R__

There are 19 13-letter words that match _____O____R__. 4 are common words, such as MILLIONNAIRES and REUPHOLSTERED. A rarer one is VENTROLATERAL. In this set, E is the most frequent open letter (17 words). 3 words contain a doubled letter.

Full list 19

millionnairesreupholsteredstratospheresstratosphericblastospheresphallocentricpneumogastricthermospheresanthropomorphchromosphereschromosphericdumbfounderedhomopolymericintraocularlyreencounteredselenocentricsomatopleuresthermosphericventrolateral

About this list

Words
19 (4 common words)
Common example
millionnaires
Rare example
ventrolateral
Doubled letters
3
Ending in S
6
Most frequent letter
E (17)

Questions

How many 13-letter words matching _____o____r__ are there?

19. 4 of them are common words.

What is a common example?

MILLIONNAIRES is among the common words in this set.