15-Letter Words Matching ________E_I____

There are 18 15-letter words that match ________E_I____. 3 are common words, such as AMBIDEXTERITIES and CARCINOGENICITY. A rarer one is PSYCHOCHEMICALS. In this set, T is the most frequent open letter (14 words). 4 words contain a doubled letter.

Full list 18

ambidexteritiescarcinogenicitydishearteninglyactinochemistrybiogeochemistrycounterpetitionimmunochemistryparallelepipedsstereochemistrythermochemistryanticompetitiveantiobscenitiesbiogeochemicalshousewifelinessmethylphenidatemouthwateringlypersnicketinesspsychochemicals

About this list

Words
18 (3 common words)
Common example
ambidexterities
Rare example
psychochemicals
Doubled letters
4
Ending in S
7
Most frequent letter
T (14)

Questions

How many 15-letter words matching ________e_i____ are there?

18. 3 of them are common words.

What is a common example?

AMBIDEXTERITIES is among the common words in this set.