13-Letter Words Matching ____X_______S

There are 12 13-letter words that match ____X_______S. 6 are common words, such as BISEXUALITIES and INTOXICATIONS. A rarer one is TRIAXIALITIES. In this set, I is the most frequent open letter (11 words). 3 words contain a doubled letter.

Full list 12

bisexualitiesintoxicationsnonexistencesnonexplosivesobnoxiousnesspreexistencesautoxidationsdetoxicationshypoxanthinesnonexecutivesrelaxednessestriaxialities

About this list

Words
12 (6 common words)
Common example
bisexualities
Rare example
triaxialities
Doubled letters
3
Ending in S
12
Most frequent letter
I (11)

Questions

How many 13-letter words matching ____x_______s are there?

12. 6 of them are common words.

What is a common example?

BISEXUALITIES is among the common words in this set.