15-Letter Words Containing TM

There are 18 15-letter words that contain TM. 7 are common words, such as ATMOSPHERICALLY and DEPARTMENTALIZE. A rarer one is POSTMILLENARIAN. In this set, E is the most frequent open letter (17 words). 6 words contain a doubled letter.

Full list 18

atmosphericallydepartmentalizedisappointmentsdiscontentmentsdisenchantmentsnondepartmentaltoastmistressesdepartmentalismdisconcertmentsovercommitmentsunderinvestmentconcertmeistersmontmorilloniteoutmanipulatingoveradjustmentsoverinvestmentspostmastershipspostmillenarian

About this list

Words
18 (7 common words)
Common example
atmospherically
Rare example
postmillenarian
Doubled letters
6
Ending in S
10
Most frequent letter
E (17)

Questions

How many 15-letter words containing tm are there?

18. 7 of them are common words.

What is a common example?

ATMOSPHERICALLY is among the common words in this set.