15-Letter Words Matching _______R_P_____

There are 19 15-letter words that match _______R_P_____. 3 are common words, such as BIBLIOGRAPHICAL and LEXICOGRAPHICAL. A rarer one is NONBIOGRAPHICAL. In this set, I is the most frequent open letter (18 words). 7 words contain a doubled letter.

Full list 19

bibliographicallexicographicalsuperscriptionsimperscriptibleoceanographicalphysiographicalstratigraphicaluninterruptedlyuninterruptiblezoogeographicalallotetraploidsallotetraploidyanticorruptionsautotetraploidsautotetraploidybiogeographicalmegasporophyllsmisdescriptionsnonbiographical

About this list

Words
19 (3 common words)
Common example
bibliographical
Rare example
nonbiographical
Doubled letters
7
Ending in S
6
Most frequent letter
I (18)

Questions

How many 15-letter words matching _______r_p_____ are there?

19. 3 of them are common words.

What is a common example?

BIBLIOGRAPHICAL is among the common words in this set.