15-Letter Words Matching __M_T__________

There are 20 15-letter words that match __M_T__________. 6 are common words, such as BUMPTIOUSNESSES and IMMATERIALITIES. A rarer one is UNMITIGATEDNESS. In this set, I is the most frequent open letter (18 words). 10 words contain a doubled letter.

Full list 20

bumptiousnessesimmaterialitieslimitlessnessessemitransparentsumptuousnessessymptomaticallydematerializingdemythologizingimmaterializingcomptrollershipdemythologizershematoporphyrinhomotransplantsimmutablenessesrematerializingremythologizingsemiterrestrialsemitranslucentsymptomatologicunmitigatedness

About this list

Words
20 (6 common words)
Common example
bumptiousnesses
Rare example
unmitigatedness
Doubled letters
10
Ending in S
8
Most frequent letter
I (18)

Questions

How many 15-letter words matching __m_t__________ are there?

20. 6 of them are common words.

What is a common example?

BUMPTIOUSNESSES is among the common words in this set.