13-Letter Words Matching ___S_____R___

There are 18 13-letter words that match ___S_____R___. 4 are common words, such as BOYSENBERRIES and DISSIMILARITY. A rarer one is TENSIOMETRIES. In this set, I is the most frequent open letter (18 words). 10 words contain a doubled letter.

Full list 18

boysenberriesdissimilarityphysiotherapytoastmistressbalsamiferousfossiliferoushousemistresshousewiferiesrensselaeritetrisaccharideaxisymmetriesdissymmetriesglasspaperingphosphaturiasprosecutorialquestionariesseismometriestensiometries

About this list

Words
18 (4 common words)
Common example
boysenberries
Rare example
tensiometries
Doubled letters
10
Ending in S
12
Most frequent letter
I (18)

Questions

How many 13-letter words matching ___s_____r___ are there?

18. 4 of them are common words.

What is a common example?

BOYSENBERRIES is among the common words in this set.