15-Letter Words Matching _____R____R____

There are 12 15-letter words that match _____R____R____. 1 are common words, such as PRETERNATURALLY and CONSERVATORSHIP. A rarer one is UNIFORMITARIANS. In this set, T is the most frequent open letter (12 words). 2 words contain a doubled letter.

Full list 12

preternaturallyconservatorshipelectrophoreseselectrophoresiselectrophoreticelectrothermicsisoperimetricalbiostratigraphycomptrollershipelectrophoresednonbarbituratesuniformitarians

About this list

Words
12 (1 common words)
Common example
preternaturally
Rare example
uniformitarians
Doubled letters
2
Ending in S
5
Most frequent letter
T (12)

Questions

How many 15-letter words matching _____r____r____ are there?

12. 1 of them are common words.

What is a common example?

PRETERNATURALLY is among the common words in this set.