15-Letter Words Matching ____E_I________

There are 28 15-letter words that match ____E_I________. 10 are common words, such as BACTERIOLOGICAL and BACTERIOLOGISTS. A rarer one is UNFEELINGNESSES. In this set, S is the most frequent open letter (26 words). 14 words contain a doubled letter.

Full list 28

Common words

bacteriologicalbacteriologistscompetitivenessepidemiologistseuphemisticallyimprecisenessesincredibilitiesinflexibilitiespreregistrationsecretivenessesasclepiadaceouscongenialnesses
bacteriologicalbacteriologistscompetitivenessepidemiologistseuphemisticallyimprecisenessesincredibilitiesinflexibilitiespreregistrationsecretivenessesasclepiadaceouscongenialnessesecclesiasticismepidemiologicalhousemistressesisoperimetricalreflexivenessesstereoisomerismbacteriophagiesecclesiologicalecclesiologistshousewifelinesskittenishnesseslickerishnessesmisregistrationnonsedimentableprerevisionistsunfeelingnesses

About this list

Words
28 (10 common words)
Common example
bacteriological
Rare example
unfeelingnesses
Doubled letters
14
Ending in S
18
Most frequent letter
S (26)

Questions

How many 15-letter words matching ____e_i________ are there?

28. 10 of them are common words.

What is a common example?

BACTERIOLOGICAL is among the common words in this set.