12-Letter Words Matching _________X_S

There are 18 12-letter words that match _________X_S. 5 are common words, such as ANTICLIMAXES and CHATTERBOXES. A rarer one is TROPHALLAXIS. In this set, E is the most frequent open letter (16 words). 7 words contain a doubled letter.

Full list 18

anticlimaxeschatterboxeschickenpoxescircumflexesdominatrixesanticathexisinheritrixesseparatrixessqueezeboxesgoogolplexesmesothoraxesmetathoraxesmorphallaxesmorphallaxisoropharynxessuperhelixestrophallaxestrophallaxis

About this list

Words
18 (5 common words)
Common example
anticlimaxes
Rare example
trophallaxis
Doubled letters
7
Ending in S
18
Most frequent letter
E (16)

Questions

How many 12-letter words matching _________x_s are there?

18. 5 of them are common words.

What is a common example?

ANTICLIMAXES is among the common words in this set.