12-Letter Words Matching ___P____O___

There are 20 12-letter words that match ___P____O___. 5 are common words, such as COMPLEXIONAL and COMPLEXIONED. A rarer one is TRYPANOSOMES. In this set, I is the most frequent open letter (15 words). 4 words contain a doubled letter.

Full list 20

complexionalcomplexionedharpsichordsproportionalproportionedadaptationalclapperboardherpetologicscuppernongsslipperwortsanaplasmosesanaplasmosiscompatrioticnonpsychoticpreportionedprophethoodsscyphistomaescyphistomassniperscopestrypanosomes

About this list

Words
20 (5 common words)
Common example
complexional
Rare example
trypanosomes
Doubled letters
4
Ending in S
9
Most frequent letter
I (15)

Questions

How many 12-letter words matching ___p____o___ are there?

20. 5 of them are common words.

What is a common example?

COMPLEXIONAL is among the common words in this set.