15-Letter Words Matching ____EM_________

There are 20 15-letter words that match ____EM_________. 7 are common words, such as CONTEMPORANEITY and CONTEMPORANEOUS. A rarer one is OVEREMBELLISHES. In this set, I is the most frequent open letter (19 words). 5 words contain a doubled letter.

Full list 20

contemporaneitycontemporaneousepidemiologistseuphemisticallyimplementationsoveremphasizingsystematizationbioremediationscontemplativelycontemptibilityepidemiologicalhousemistressesincrementalistscommemorativelydistemperaturesexcrementitiousincrementalismsmathematizationoverembellishedoverembellishes

About this list

Words
20 (7 common words)
Common example
contemporaneity
Rare example
overembellishes
Doubled letters
5
Ending in S
10
Most frequent letter
I (19)

Questions

How many 15-letter words matching ____em_________ are there?

20. 7 of them are common words.

What is a common example?

CONTEMPORANEITY is among the common words in this set.