14-Letter Words Matching _____X_______S

There are 12 14-letter words that match _____X_______S. 2 are common words, such as APPROXIMATIONS and CONTEXTUALIZES. A rarer one is UNISEXUALITIES. In this set, I is the most frequent open letter (12 words). 4 words contain a doubled letter.

Full list 12

approximationscontextualizescarboxylationshydroxylamineshydroxylationsinflexiblenessoverexpansionsoverextensionspansexualitiespremaxillariessubmaxillariesunisexualities

About this list

Words
12 (2 common words)
Common example
approximations
Rare example
unisexualities
Doubled letters
4
Ending in S
12
Most frequent letter
I (12)

Questions

How many 14-letter words matching _____x_______s are there?

12. 2 of them are common words.

What is a common example?

APPROXIMATIONS is among the common words in this set.