15-Letter Words Matching _____E_______I_

There are 12 15-letter words that match _____E_______I_. 2 are common words, such as MICROELECTRONIC and PARTHENOGENESIS. A rarer one is PROGRESSIVISTIC. In this set, R is the most frequent open letter (11 words). 3 words contain a doubled letter.

Full list 12

microelectronicparthenogenesisantiperistalsisoverpessimisticparthenogeneticpseudepigraphicindeterministicinterelectronicleukaemogenesisphotoelectronicposthemorrhagicprogressivistic

About this list

Words
12 (2 common words)
Common example
microelectronic
Rare example
progressivistic
Doubled letters
3
Ending in S
3
Most frequent letter
R (11)

Questions

How many 15-letter words matching _____e_______i_ are there?

12. 2 of them are common words.

What is a common example?

MICROELECTRONIC is among the common words in this set.