15-Letter Words Matching ____R_S________

There are 29 15-letter words that match ____R_S________. 11 are common words, such as ATHEROSCLEROSES and ATHEROSCLEROSIS. A rarer one is SUPPRESSIVENESS. In this set, I is the most frequent open letter (27 words). 13 words contain a doubled letter.

Full list 29

Common words

atherosclerosesatherosclerosiscongresspersonsheterosexualitynonprescriptionprocrastinatingprocrastinationprocrastinatorsprogressivenessunderestimatingunderestimationatherosclerotic
atherosclerosesatherosclerosiscongresspersonsheterosexualitynonprescriptionprocrastinatingprocrastinationprocrastinatorsprogressivenessunderestimatingunderestimationatheroscleroticcentrosymmetriccompressibilitycongressionallydextrosinistraldistrustfulnessimperishabilitymistrustfulnessprocrastinatoryprogressivitiesdistressfulnessinterestingnessnonaristocraticpararosanilinesprepresidentialprogressivisticsuppressibilitysuppressiveness

About this list

Words
29 (11 common words)
Common example
atheroscleroses
Rare example
suppressiveness
Doubled letters
13
Ending in S
12
Most frequent letter
I (27)

Questions

How many 15-letter words matching ____r_s________ are there?

29. 11 of them are common words.

What is a common example?

ATHEROSCLEROSES is among the common words in this set.