13-Letter Words Matching ____R_______R

There are 22 13-letter words that match ____R_______R. 3 are common words, such as DISCRIMINATOR and SUPERCOMPUTER. A rarer one is UNDERGROUNDER. In this set, E is the most frequent open letter (20 words). 6 words contain a doubled letter.

Full list 22

discriminatorsupercomputerunderachieversuperspreadercongratulatorintercellularproprioceptorsuperachieversupercollidersupercolumnarunderstrapperhyperproducerinterbehaviorintergranularinterobserverinterpellatornonprogrammersupercalendersuperenciphersuperministersuperthrillerundergrounder

About this list

Words
22 (3 common words)
Common example
discriminator
Rare example
undergrounder
Doubled letters
6
Ending in S
0
Most frequent letter
E (20)

Questions

How many 13-letter words matching ____r_______r are there?

22. 3 of them are common words.

What is a common example?

DISCRIMINATOR is among the common words in this set.