15-Letter Words Matching ____________R_S

There are 16 15-letter words that match ____________R_S. 5 are common words, such as CONCESSIONAIRES and COUNTERCULTURES. A rarer one is ULTRASTRUCTURES. In this set, E is the most frequent open letter (16 words). 2 words contain a doubled letter.

Full list 16

concessionairescounterculturescountermeasuresinfrastructuressuperstructurescommissionaireschordamesodermscontainerboardscytomegalovirusdistemperaturesmacrostructuresmicrostructurespremanufacturessporangiophoresultimogenituresultrastructures

About this list

Words
16 (5 common words)
Common example
concessionaires
Rare example
ultrastructures
Doubled letters
2
Ending in S
16
Most frequent letter
E (16)

Questions

How many 15-letter words matching ____________r_s are there?

16. 5 of them are common words.

What is a common example?

CONCESSIONAIRES is among the common words in this set.