10-Letter Words Matching _______EM_

There are 12 10-letter words that match _______EM_. 4 are common words, such as DISESTEEMS and ECOSYSTEMS. A rarer one is NONSYSTEMS. In this set, S is the most frequent open letter (9 words). 3 words contain a doubled letter.

Full list 12

disesteemsecosystemsstratagemssubsystemschromonemaprecondemnquadriremebrummagemschernozemsmetaxylemsmisesteemsnonsystems

About this list

Words
12 (4 common words)
Common example
disesteems
Rare example
nonsystems
Doubled letters
3
Ending in S
9
Most frequent letter
S (9)

Questions

How many 10-letter words matching _______em_ are there?

12. 4 of them are common words.

What is a common example?

DISESTEEMS is among the common words in this set.