13-Letter Words Matching ____P_____A__

There are 18 13-letter words that match ____P_____A__. 2 are common words, such as INAPPROPRIATE and NONSPIRITUALS. A rarer one is REAPPROPRIATE. In this set, O is the most frequent open letter (16 words). 3 words contain a doubled letter.

Full list 18

inappropriatenonspiritualsendopeptidaseequiponderatehypophosphatemetaphosphatephosphorylasepyrophosphatesemiporcelainstreptokinaseterephthalateequiponderanthypopituitarymisappraisalsphosphokinasephospholipasephosphorylatereappropriate

About this list

Words
18 (2 common words)
Common example
inappropriate
Rare example
reappropriate
Doubled letters
3
Ending in S
2
Most frequent letter
O (16)

Questions

How many 13-letter words matching ____p_____a__ are there?

18. 2 of them are common words.

What is a common example?

INAPPROPRIATE is among the common words in this set.