15-Letter Words Matching _________T___T_

There are 18 15-letter words that match _________T___T_. 4 are common words, such as DISAPPOINTMENTS and DISCONTENTMENTS. A rarer one is VISCOELASTICITY. In this set, E is the most frequent open letter (18 words). 3 words contain a doubled letter.

Full list 18

disappointmentsdiscontentmentsdisenchantmentsinstrumentalityantepenultimatecomplementaritydisconcertmentsmetropolitanateovercommitmentsoversensitivityphotoelasticityhyperreactivitymicrogametocyteneuroblastomataoveradjustmentsoverinvestmentssuperplasticityviscoelasticity

About this list

Words
18 (4 common words)
Common example
disappointments
Rare example
viscoelasticity
Doubled letters
3
Ending in S
7
Most frequent letter
E (18)

Questions

How many 15-letter words matching _________t___t_ are there?

18. 4 of them are common words.

What is a common example?

DISAPPOINTMENTS is among the common words in this set.