15-Letter Words Matching ____T_N________

There are 12 15-letter words that match ____T_N________. 5 are common words, such as EXISTENTIALISMS and EXISTENTIALISTS. A rarer one is SUBSTANTIVIZING. In this set, A is the most frequent open letter (12 words). 5 words contain a doubled letter.

Full list 12

existentialismsexistentialistsinattentivenesssubstantiationsunintentionallycryptanalyticalgelatinizationskeratinizationsspontaneousnesssubstantialnesssubstantivenesssubstantivizing

About this list

Words
12 (5 common words)
Common example
existentialisms
Rare example
substantivizing
Doubled letters
5
Ending in S
9
Most frequent letter
A (12)

Questions

How many 15-letter words matching ____t_n________ are there?

12. 5 of them are common words.

What is a common example?

EXISTENTIALISMS is among the common words in this set.