15-Letter Words Matching M____________T_

There are 18 15-letter words that match M____________T_. 4 are common words, such as MAINTAINABILITY and MANEUVERABILITY. A rarer one is MULTIWAVELENGTH. In this set, I is the most frequent open letter (16 words). 4 words contain a doubled letter.

Full list 18

maintainabilitymaneuverabilitymarriageabilitymicrobiologistsmalnourishmentsmerchantabilitymetropolitanatemegagametophytemetafictionistsmethylphenidatemicrogametocytemicroseismicitymismeasurementsmonopropellantsmonospecificitymonosyllabicitymontmorillonitemultiwavelength

About this list

Words
18 (4 common words)
Common example
maintainability
Rare example
multiwavelength
Doubled letters
4
Ending in S
5
Most frequent letter
I (16)

Questions

How many 15-letter words matching m____________t_ are there?

18. 4 of them are common words.

What is a common example?

MAINTAINABILITY is among the common words in this set.