15-Letter Words Matching ____T_____S____

There are 12 15-letter words that match ____T_____S____. 5 are common words, such as COUNTERMEASURES and FLIRTATIOUSNESS. A rarer one is SPONTANEOUSNESS. 9 words contain a doubled letter.

Full list 12

countermeasuresflirtatiousnessmeritoriousnesspunctiliousnessrepetitiousnesscounterpressuredeleteriousnesscounterquestiondiastereoisomermountainousnessprestigiousnessspontaneousness

About this list

Words
12 (5 common words)
Common example
countermeasures
Rare example
spontaneousness
Doubled letters
9
Ending in S
9

Questions

How many 15-letter words matching ____t_____s____ are there?

12. 5 of them are common words.

What is a common example?

COUNTERMEASURES is among the common words in this set.