14-Letter Words Matching _R________R___

There are 17 14-letter words that match _R________R___. 4 are common words, such as ARCHBISHOPRICS and GRANDFATHERING. A rarer one is PROTOHISTORIAN. In this set, I is the most frequent open letter (16 words). 3 words contain a doubled letter.

Full list 17

archbishopricsgrandfatheringpreregisteringtrigonometriesarchdeaconriesgreengroceriesorganochlorinepredestinarianpremillenarianprotohistoriestrapezohedronsprediscoveriespremaxillariesprestructuringprothonotarialprothonotariesprotohistorian

About this list

Words
17 (4 common words)
Common example
archbishoprics
Rare example
protohistorian
Doubled letters
3
Ending in S
9
Most frequent letter
I (16)

Questions

How many 14-letter words matching _r________r___ are there?

17. 4 of them are common words.

What is a common example?

ARCHBISHOPRICS is among the common words in this set.