15-Letter Words Matching T____________S_

There are 13 15-letter words that match T____________S_. 6 are common words, such as TEMPESTUOUSNESS and TENDENTIOUSNESS. A rarer one is TRUEHEARTEDNESS. In this set, E is the most frequent open letter (12 words). 10 words contain a doubled letter.

Full list 13

tempestuousnesstendentiousnessthoughtlessnesstotalitarianismtreacherousnesstrustworthinessthromboembolismtemerariousnessthermoperiodismtightfistednesstransparentnesstroublesomenesstrueheartedness

About this list

Words
13 (6 common words)
Common example
tempestuousness
Rare example
trueheartedness
Doubled letters
10
Ending in S
10
Most frequent letter
E (12)

Questions

How many 15-letter words matching t____________s_ are there?

13. 6 of them are common words.

What is a common example?

TEMPESTUOUSNESS is among the common words in this set.