15-Letter Words Matching E____O_________

There are 16 15-letter words that match E____O_________. 3 are common words, such as ENVIRONMENTALLY and EQUIVOCALNESSES. A rarer one is EPIZOOTIOLOGIES. In this set, I is the most frequent open letter (15 words). 8 words contain a doubled letter.

Full list 16

environmentallyequivocalnessesextraordinarilyepiscopalianismeasygoingnessesechinodermatousembryologicallyemotionlessnessenterobacterialenterobacteriumenterocolitisesenterogastronesentomologicallyenvenomizationsepeirogenicallyepizootiologies

About this list

Words
16 (3 common words)
Common example
environmentally
Rare example
epizootiologies
Doubled letters
8
Ending in S
8
Most frequent letter
I (15)

Questions

How many 15-letter words matching e____o_________ are there?

16. 3 of them are common words.

What is a common example?

ENVIRONMENTALLY is among the common words in this set.