15-Letter Words Matching T_I____________

There are 12 15-letter words that match T_I____________. 3 are common words, such as TRIGONOMETRICAL and TRINITROTOLUENE. A rarer one is TRISOCTAHEDRONS. In this set, N is the most frequent open letter (12 words). 1 words contain a doubled letter.

Full list 12

trigonometricaltrinitrotoluenetrivializationstribromoethanoltrinitrobenzenethinkablenessestriangularitiestrichomonacidaltrichomonacidestrifluoperazinetrihalomethanestrisoctahedrons

About this list

Words
12 (3 common words)
Common example
trigonometrical
Rare example
trisoctahedrons
Doubled letters
1
Ending in S
6
Most frequent letter
N (12)

Questions

How many 15-letter words matching t_i____________ are there?

12. 3 of them are common words.

What is a common example?

TRIGONOMETRICAL is among the common words in this set.