15-Letter Words Matching ____E_____O____

There are 17 15-letter words that match ____E_____O____. 7 are common words, such as BIOTECHNOLOGIES and CONSERVATIONISM. A rarer one is SUBTERRANEOUSLY. 4 words contain a doubled letter.

Full list 17

biotechnologiesconservationismconservationistmiscellaneouslypreservationistsurreptitiouslyunpretentiouslybiotechnologistdessertspoonfulpresentationismpreservationismvespertilionineconsentaneouslyoptoelectronicspolyelectrolytesubreptitiouslysubterraneously

About this list

Words
17 (7 common words)
Common example
biotechnologies
Rare example
subterraneously
Doubled letters
4
Ending in S
2

Questions

How many 15-letter words matching ____e_____o____ are there?

17. 7 of them are common words.

What is a common example?

BIOTECHNOLOGIES is among the common words in this set.