13-Letter Words Matching ________R__O_

There are 17 13-letter words that match ________R__O_. 4 are common words, such as ADMINISTRATOR and ANIMADVERSION. A rarer one is REINVIGORATOR. In this set, N is the most frequent open letter (16 words). 2 words contain a doubled letter.

Full list 17

administratoranimadversiondisproportioninterspersionantineutrinosbioconversiondisconcertiondisintegratormultivibratortransmigratorcoconspiratorconglomeratorisoproterenolnoncooperatoroverassertionpsychosurgeonreinvigorator

About this list

Words
17 (4 common words)
Common example
administrator
Rare example
reinvigorator
Doubled letters
2
Ending in S
1
Most frequent letter
N (16)

Questions

How many 13-letter words matching ________r__o_ are there?

17. 4 of them are common words.

What is a common example?

ADMINISTRATOR is among the common words in this set.