15-Letter Words Matching ____R_____S____

There are 15 15-letter words that match ____R_____S____. 4 are common words, such as BIPARTISANSHIPS and PROPRIETORSHIPS. A rarer one is UNDEREMPHASIZES. In this set, S is the most frequent open letter (14 words). 7 words contain a doubled letter.

Full list 15

bipartisanshipsproprietorshipsremorselessnesssuperfluousnesscontrollershipsdextrosinistralhyperextensionsinstructorshipshyperaggressiveinterdiffusionsnonprogressivestemerariousnessuncircumcisionsunderemphasizedunderemphasizes

About this list

Words
15 (4 common words)
Common example
bipartisanships
Rare example
underemphasizes
Doubled letters
7
Ending in S
12
Most frequent letter
S (14)

Questions

How many 15-letter words matching ____r_____s____ are there?

15. 4 of them are common words.

What is a common example?

BIPARTISANSHIPS is among the common words in this set.