12-Letter Words Matching ______R__R__

There are 21 12-letter words that match ______R__R__. 3 are common words, such as COUNTERPARTS and OLEOMARGARIN. A rarer one is THUNDERBIRDS. In this set, E is the most frequent open letter (19 words). 3 words contain a doubled letter.

Full list 21

counterpartsoleomargarinweatherstripbladderwortsbutcherbirdscheckerberrycounterforcecountermarchmicroprogramslipperwortscounterfiredcounterfirescounterworldlacquerwareslacquerworksmetacercariaplasterworksstandardbredsubmicrogramthitherwardsthunderbirds

About this list

Words
21 (3 common words)
Common example
counterparts
Rare example
thunderbirds
Doubled letters
3
Ending in S
10
Most frequent letter
E (19)

Questions

How many 12-letter words matching ______r__r__ are there?

21. 3 of them are common words.

What is a common example?

COUNTERPARTS is among the common words in this set.