13-Letter Words Matching ________R_P__

There are 21 13-letter words that match ________R_P__. 3 are common words, such as AUTOBIOGRAPHY and PHILANTHROPIC. A rarer one is SUBPARAGRAPHS. In this set, O is the most frequent open letter (20 words). 3 words contain a doubled letter.

Full list 21

autobiographyphilanthropicrephotographsanisometropiaapheliotropicdactylographyelectrographshypermetropiametallographyoscillographsspectrographsspectrographyanisometropicarteriographycorticotropinhypermetropicmagnetographsoscillographyprosopographysphygmographssubparagraphs

About this list

Words
21 (3 common words)
Common example
autobiography
Rare example
subparagraphs
Doubled letters
3
Ending in S
7
Most frequent letter
O (20)

Questions

How many 13-letter words matching ________r_p__ are there?

21. 3 of them are common words.

What is a common example?

AUTOBIOGRAPHY is among the common words in this set.