15-Letter Words Matching M_________R____

There are 12 15-letter words that match M_________R____. 4 are common words, such as MICROELECTRONIC and MICROMETEORITES. A rarer one is MONOUNSATURATES. In this set, O is the most frequent open letter (12 words). 2 words contain a doubled letter.

Full list 12

microelectronicmicrometeoritesmonounsaturatedmountaineeringsmercaptopurinesmonosaccharidesmethoxyfluranesmicrobarographsmicroelectrodesmicrometeoriticmicrometeoroidsmonounsaturates

About this list

Words
12 (4 common words)
Common example
microelectronic
Rare example
monounsaturates
Doubled letters
2
Ending in S
9
Most frequent letter
O (12)

Questions

How many 15-letter words matching m_________r____ are there?

12. 4 of them are common words.

What is a common example?

MICROELECTRONIC is among the common words in this set.