15-Letter Words Matching _A_____N_______

There are 13 15-letter words that match _A_____N_______. 3 are common words, such as GASTROENTERITIS and HALLUCINOGENICS. A rarer one is SAPROGENICITIES. In this set, I is the most frequent open letter (13 words). 4 words contain a doubled letter.

Full list 13

gastroenteritishallucinogenicsmaintainabilityhallucinationalsarraceniaceouseasygoingnessesmaladministeredmasculinizationpathogenicitiessacramentalismssacramentalistssacrosanctitiessaprogenicities

About this list

Words
13 (3 common words)
Common example
gastroenteritis
Rare example
saprogenicities
Doubled letters
4
Ending in S
9
Most frequent letter
I (13)

Questions

How many 15-letter words matching _a_____n_______ are there?

13. 3 of them are common words.

What is a common example?

GASTROENTERITIS is among the common words in this set.