15-Letter Words Matching ____O_P________

There are 18 15-letter words that match ____O_P________. 3 are common words, such as INTROSPECTIVELY and NONCOOPERATIONS. A rarer one is NONHOSPITALIZED. 5 words contain a doubled letter.

Full list 18

introspectivelynoncooperationsretrospectivelycommonplacenessgeomorphologiesmicrosporangiummicrosporophyllmiscomprehendedphenolphthaleindephosphorylategeomorphologistintrospectionalmicrosporocytesmiscomputationsnincompooperiesnoncompressiblenoncomputerizednonhospitalized

About this list

Words
18 (3 common words)
Common example
introspectively
Rare example
nonhospitalized
Doubled letters
5
Ending in S
6

Questions

How many 15-letter words matching ____o_p________ are there?

18. 3 of them are common words.

What is a common example?

INTROSPECTIVELY is among the common words in this set.