9-Letter Words Matching _____P__N

There are 12 9-letter words that match _____P__N. 1 are common words, such as ENDORPHIN and AMYLOPSIN. A rarer one is RHODOPSIN. In this set, O is the most frequent open letter (10 words). 1 words contain a doubled letter.

Full list 12

endorphinamylopsincathepsindystopianectropionfrogspawnsoupspooncyclopeanentropionmercaptanmultipionrhodopsin

About this list

Words
12 (1 common words)
Common example
endorphin
Rare example
rhodopsin
Doubled letters
1
Ending in S
0
Most frequent letter
O (10)

Questions

How many 9-letter words matching _____p__n are there?

12. 1 of them are common words.

What is a common example?

ENDORPHIN is among the common words in this set.