15-Letter Words Matching ___R________N__

There are 19 15-letter words that match ___R________N__. 4 are common words, such as AGGRANDIZEMENTS and IMPROVISATIONAL. A rarer one is ULTRAMARATHONER. In this set, O is the most frequent open letter (18 words). 4 words contain a doubled letter.

Full list 19

aggrandizementsimprovisationalmicroelectronicnitroglycerineshydrocortisonesovercommitmentsovercomplacencyoverrefinementscyproheptadineshydroxyprolinesintrospectionalnonrecombinantsoveradjustmentsoverassessmentsoverentertainedoverinvestmentsthermoremanencethyrocalcitoninultramarathoner

About this list

Words
19 (4 common words)
Common example
aggrandizements
Rare example
ultramarathoner
Doubled letters
4
Ending in S
11
Most frequent letter
O (18)

Questions

How many 15-letter words matching ___r________n__ are there?

19. 4 of them are common words.

What is a common example?

AGGRANDIZEMENTS is among the common words in this set.