12-Letter Words Matching _________X__

There are 21 12-letter words that match _________X__. 5 are common words, such as ANTICLIMAXES and CHATTERBOXES. A rarer one is UNORTHODOXLY. 7 words contain a doubled letter.

Full list 21

anticlimaxeschatterboxeschickenpoxescircumflexesdominatrixesanticathexishyperpyrexiainheritrixesseparatrixessqueezeboxesgoogolplexesmesothoraxesmetathoraxesmorphallaxesmorphallaxisoropharynxessuperhelixestetrodotoxintrophallaxestrophallaxisunorthodoxly

About this list

Words
21 (5 common words)
Common example
anticlimaxes
Rare example
unorthodoxly
Doubled letters
7
Ending in S
18

Questions

How many 12-letter words matching _________x__ are there?

21. 5 of them are common words.

What is a common example?

ANTICLIMAXES is among the common words in this set.