12-Letter Words Matching _X_________Y

There are 20 12-letter words that match _X_________Y. 7 are common words, such as EXCITABILITY and EXHAUSTIVELY. A rarer one is EXTRAMURALLY. In this set, E is the most frequent open letter (20 words). 8 words contain a doubled letter.

Full list 20

excitabilityexhaustivelyexorbitantlyexpansionaryexpressivelyextraneouslyextrasensoryexaggeratoryexclusionaryexpressivityextortionaryextralegallyextravagancyexcrescentlyexhaustivityexotericallyexothermallyextemporallyextractivelyextramurally

About this list

Words
20 (7 common words)
Common example
excitability
Rare example
extramurally
Doubled letters
8
Ending in S
0
Most frequent letter
E (20)

Questions

How many 12-letter words matching _x_________y are there?

20. 7 of them are common words.

What is a common example?

EXCITABILITY is among the common words in this set.