15-Letter Words Matching _______E___O___

There are 13 15-letter words that match _______E___O___. 3 are common words, such as MICROELECTRONIC and NONPROFESSIONAL. A rarer one is PHOTOELECTRONIC. In this set, I is the most frequent open letter (13 words). 3 words contain a doubled letter.

Full list 13

microelectronicnonprofessionalsubprofessionalnonconventionalomnidirectionalpreprofessionaldiastereoisomerinterelectrodesinterelectronicintrospectionalmicroelectrodesnoninflectionalphotoelectronic

About this list

Words
13 (3 common words)
Common example
microelectronic
Rare example
photoelectronic
Doubled letters
3
Ending in S
2
Most frequent letter
I (13)

Questions

How many 15-letter words matching _______e___o___ are there?

13. 3 of them are common words.

What is a common example?

MICROELECTRONIC is among the common words in this set.