12-Letter Words Matching _____N____S_

There are 21 12-letter words that match _____N____S_. 8 are common words, such as CLARINETTIST and DISTINCTNESS. A rarer one is SUSPENSELESS. In this set, I is the most frequent open letter (20 words). 16 words contain a doubled letter.

Full list 21

clarinettistdistinctnessmeetinghousemercantilismpackinghouseslovenlinesssuccinctnessungainlinesscommensalismheavenlinessmatronlinessmercantilistoverinterestrationalnessscrounginessbuccaneerishhardinggrassmaidenlinessparkinsonismresignednesssuspenseless

About this list

Words
21 (8 common words)
Common example
clarinettist
Rare example
suspenseless
Doubled letters
16
Ending in S
12
Most frequent letter
I (20)

Questions

How many 12-letter words matching _____n____s_ are there?

21. 8 of them are common words.

What is a common example?

CLARINETTIST is among the common words in this set.