13-Letter Words Matching ______TN_____

There are 18 13-letter words that match ______TN_____. 9 are common words, such as ANCIENTNESSES and COMPACTNESSES. A rarer one is VALIANTNESSES. 18 words contain a doubled letter.

Full list 18

ancientnessescompactnessescorrectnessescorruptnessesearnestnessesillicitnessesinexactnessesperfectnessesuprightnessescurrentnessespresentnessesunkemptnessesdistantnessesinstantnessespiquantnessesunquietnessesuptightnessesvaliantnesses

About this list

Words
18 (9 common words)
Common example
ancientnesses
Rare example
valiantnesses
Doubled letters
18
Ending in S
18

Questions

How many 13-letter words matching ______tn_____ are there?

18. 9 of them are common words.

What is a common example?

ANCIENTNESSES is among the common words in this set.