13-Letter Words Matching _P________O__

There are 13 13-letter words that match _P________O__. 7 are common words, such as APPRECIATIONS and APPREHENSIONS. A rarer one is OPTIMISATIONS. In this set, S is the most frequent open letter (11 words). 6 words contain a doubled letter.

Full list 13

appreciationsapprehensionsappropriatorsophthalmologyoptimizationsspinsterhoodsspokespersonsapperceptionsspermatophoresplanchnologysplendiferousepizootiologyoptimisations

About this list

Words
13 (7 common words)
Common example
appreciations
Rare example
optimisations
Doubled letters
6
Ending in S
9
Most frequent letter
S (11)

Questions

How many 13-letter words matching _p________o__ are there?

13. 7 of them are common words.

What is a common example?

APPRECIATIONS is among the common words in this set.