15-Letter Words Matching _R__R__________

There are 18 15-letter words that match _R__R__________. 6 are common words, such as PREARRANGEMENTS and PROCRASTINATING. A rarer one is PROGRESSIVISTIC. In this set, I is the most frequent open letter (17 words). 7 words contain a doubled letter.

Full list 18

prearrangementsprocrastinatingprocrastinationprocrastinatorsprogressivenessproprietorshipsarboriculturistpreprofessionalprocrastinatoryprogrammabilityprogressivitiesproprietoriallyproprioceptionstribromoethanolarteriographiesprepresidentialprioritizationsprogressivistic

About this list

Words
18 (6 common words)
Common example
prearrangements
Rare example
progressivistic
Doubled letters
7
Ending in S
8
Most frequent letter
I (17)

Questions

How many 15-letter words matching _r__r__________ are there?

18. 6 of them are common words.

What is a common example?

PREARRANGEMENTS is among the common words in this set.