15-Letter Words Matching ____S___L______

There are 12 15-letter words that match ____S___L______. 3 are common words, such as DISESTABLISHING and OVERSIMPLIFYING. A rarer one is WHIMSICALNESSES. In this set, I is the most frequent open letter (11 words). 5 words contain a doubled letter.

Full list 12

disestablishingoversimplifyingverisimilitudesantishopliftingindisciplinableparasitologicalparasitologistspreestablishingredistillationsreinstallationsreposefulnesseswhimsicalnesses

About this list

Words
12 (3 common words)
Common example
disestablishing
Rare example
whimsicalnesses
Doubled letters
5
Ending in S
6
Most frequent letter
I (11)

Questions

How many 15-letter words matching ____s___l______ are there?

12. 3 of them are common words.

What is a common example?

DISESTABLISHING is among the common words in this set.