15-Letter Words Matching ____T_I________

There are 13 15-letter words that match ____T_I________. 6 are common words, such as ELECTRIFICATION and HEARTSICKNESSES. A rarer one is TIGHTFISTEDNESS. In this set, A is the most frequent open letter (12 words). 6 words contain a doubled letter.

Full list 13

electrificationheartsicknessesmaintainabilitymountaineeringstheatricalitiestoastmistressesdenitrificationinextricabilityunattainabilitydevitrificationmountainousnesstheatricalizingtightfistedness

About this list

Words
13 (6 common words)
Common example
electrification
Rare example
tightfistedness
Doubled letters
6
Ending in S
6
Most frequent letter
A (12)

Questions

How many 15-letter words matching ____t_i________ are there?

13. 6 of them are common words.

What is a common example?

ELECTRIFICATION is among the common words in this set.