13-Letter Words Matching ____P_____O__

There are 22 13-letter words that match ____P_____O__. 10 are common words, such as DECAPITATIONS and DEPOPULATIONS. A rarer one is SLUMPFLATIONS. In this set, I is the most frequent open letter (22 words). 4 words contain a doubled letter.

Full list 22

decapitationsdepopulationsdilapidationsexasperationsmanipulationsperspicaciousperspirationsrecuperationssteppingstonevituperationsreimpositionsallopolyploidantipredatorsautopolyploidconspirationsderepressionsendopolyploidpostpositionsreciprocatorsreimpressionsrepopulationsslumpflations

About this list

Words
22 (10 common words)
Common example
decapitations
Rare example
slumpflations
Doubled letters
4
Ending in S
18
Most frequent letter
I (22)

Questions

How many 13-letter words matching ____p_____o__ are there?

22. 10 of them are common words.

What is a common example?

DECAPITATIONS is among the common words in this set.