14-Letter Words Matching __IS__________

There are 18 14-letter words that match __IS__________. 6 are common words, such as BLISSFULNESSES and BOISTEROUSNESS. A rarer one is WHISTLEBLOWING. In this set, E is the most frequent open letter (17 words). 5 words contain a doubled letter.

Full list 18

blissfulnessesboisterousnessexistentialismexistentialistseismographersseismographiesanisometropiasepistemologiesepistemologisttrisaccharidestrisoctahedronaxisymmetricalopisthobranchstristfulnessestrisubstitutedunisexualitieswhistleblowerswhistleblowing

About this list

Words
18 (6 common words)
Common example
blissfulnesses
Rare example
whistleblowing
Doubled letters
5
Ending in S
11
Most frequent letter
E (17)

Questions

How many 14-letter words matching __is__________ are there?

18. 6 of them are common words.

What is a common example?

BLISSFULNESSES is among the common words in this set.