12-Letter Words Matching M_________C_

There are 18 12-letter words that match M_________C_. 3 are common words, such as MACROBIOTICS and MAGNIFICENCE. A rarer one is MYTHOMANIACS. In this set, I is the most frequent open letter (18 words). 2 words contain a doubled letter.

Full list 18

macrobioticsmagnificencemispronouncemelancholicsmacrophysicsmellifluencemicrobalancemicrofinancemicrophysicsmultivalencemultivalencymeningococcimetacentricsmicrophonicsmisreferencemultiproductmultiservicemythomaniacs

About this list

Words
18 (3 common words)
Common example
macrobiotics
Rare example
mythomaniacs
Doubled letters
2
Ending in S
7
Most frequent letter
I (18)

Questions

How many 12-letter words matching m_________c_ are there?

18. 3 of them are common words.

What is a common example?

MACROBIOTICS is among the common words in this set.