12-Letter Words Matching ________R__R

There are 12 12-letter words that match ________R__R. 4 are common words, such as CHEESEBURGER and SKATEBOARDER. A rarer one is SUPERCARRIER. In this set, E is the most frequent open letter (12 words). 4 words contain a doubled letter.

Full list 12

cheeseburgerskateboardersuperchargerturbochargerveggieburgerbrainstormercontrovertercounterorderneedleworkernonconformernonperformersupercarrier

About this list

Words
12 (4 common words)
Common example
cheeseburger
Rare example
supercarrier
Doubled letters
4
Ending in S
0
Most frequent letter
E (12)

Questions

How many 12-letter words matching ________r__r are there?

12. 4 of them are common words.

What is a common example?

CHEESEBURGER is among the common words in this set.