8-Letter Words Matching ___M_X__

There are 12 8-letter words that match ___M_X__. 5 are common words, such as CLIMAXED and CLIMAXES. A rarer one is PANMIXIS. In this set, I is the most frequent open letter (11 words). 3 words contain a doubled letter.

Full list 12

climaxedclimaxeslummoxespremixedpremixesapomixiscommixedcommixesapomixespanmixespanmixiapanmixis

About this list

Words
12 (5 common words)
Common example
climaxed
Rare example
panmixis
Doubled letters
3
Ending in S
8
Most frequent letter
I (11)

Questions

How many 8-letter words matching ___m_x__ are there?

12. 5 of them are common words.

What is a common example?

CLIMAXED is among the common words in this set.