15-Letter Words Matching __E__I_________

There are 17 15-letter words that match __E__I_________. 2 are common words, such as IDENTIFICATIONS and OVERSIMPLIFYING. A rarer one is STEROIDOGENESIS. In this set, S is the most frequent open letter (16 words). 7 words contain a doubled letter.

Full list 17

identificationsoversimplifyingadenoidectomiesidenticalnessesplentifulnessesprestidigitatorquestionabilityunequivocalnessinefficaciouslykremlinologistsoverdiscountingoverdiversitiesoverwithholdingprestigiousnessprettificationssteroidogenesessteroidogenesis

About this list

Words
17 (2 common words)
Common example
identifications
Rare example
steroidogenesis
Doubled letters
7
Ending in S
11
Most frequent letter
S (16)

Questions

How many 15-letter words matching __e__i_________ are there?

17. 2 of them are common words.

What is a common example?

IDENTIFICATIONS is among the common words in this set.