13-Letter Words Matching ___R________R

There are 19 13-letter words that match ___R________R. 5 are common words, such as CHOREOGRAPHER and INTRAMUSCULAR. A rarer one is ULTRAFAMILIAR. In this set, A is the most frequent open letter (17 words). 4 words contain a doubled letter.

Full list 19

choreographerintramuscularmicrocomputerquartermasterthermonuclearcharacterizerdepressomotorextracellularextravascularfibrovasculargerrymandererintracellularneuromuscularneurovascularrefractometerintravascularmicrovascularstereoregularultrafamiliar

About this list

Words
19 (5 common words)
Common example
choreographer
Rare example
ultrafamiliar
Doubled letters
4
Ending in S
0
Most frequent letter
A (17)

Questions

How many 13-letter words matching ___r________r are there?

19. 5 of them are common words.

What is a common example?

CHOREOGRAPHER is among the common words in this set.