14-Letter Words Matching ____O____R____

There are 21 14-letter words that match ____O____R____. 4 are common words, such as AUTHORITARIANS and ETHNOCENTRISMS. A rarer one is TURBOGENERATOR. In this set, E is the most frequent open letter (19 words). 3 words contain a doubled letter.

Full list 21

authoritariansethnocentrismshistoriographyosteoarthritisferroconcretesheliocentricalhydrochloridesnonconcurrenceosteoarthriticpaleogeographypaleontographyphytogeographypyelonephritisdorsoventrallyleukodystrophymicrosphericalnonmonetaristspyelonephriticrechoreographsthoroughbracesturbogenerator

About this list

Words
21 (4 common words)
Common example
authoritarians
Rare example
turbogenerator
Doubled letters
3
Ending in S
9
Most frequent letter
E (19)

Questions

How many 14-letter words matching ____o____r____ are there?

21. 4 of them are common words.

What is a common example?

AUTHORITARIANS is among the common words in this set.