15-Letter Words Matching M_____I________

There are 20 15-letter words that match M_____I________. 7 are common words, such as MAINTAINABILITY and MASOCHISTICALLY. A rarer one is MULTIMILLENNIAL. 10 words contain a doubled letter.

Full list 20

maintainabilitymasochisticallymechanisticallymicrobiologicalmicrobiologistsmountaineeringsmultilingualismmagnanimousnessmicromillimetermutualisticallymaladministeredmasculinizationmercurialnessesmicrodissectionmisarticulatingmisregistrationmountainousnessmultidisciplinemultidivisionalmultimillennial

About this list

Words
20 (7 common words)
Common example
maintainability
Rare example
multimillennial
Doubled letters
10
Ending in S
5

Questions

How many 15-letter words matching m_____i________ are there?

20. 7 of them are common words.

What is a common example?

MAINTAINABILITY is among the common words in this set.