15-Letter Words Matching _R_A___________

There are 14 15-letter words that match _R_A___________. 4 are common words, such as IRRATIONALITIES and PREADOLESCENCES. A rarer one is TRIANGULARITIES. In this set, E is the most frequent open letter (13 words). 7 words contain a doubled letter.

Full list 14

irrationalitiespreadolescencesprearrangementstreacherousnessbroadmindednessorganophosphatepreagriculturalbreathabilitiesdreamlessnessesirrationalisticorganochlorinesorganomercurialorganometallicstriangularities

About this list

Words
14 (4 common words)
Common example
irrationalities
Rare example
triangularities
Doubled letters
7
Ending in S
10
Most frequent letter
E (13)

Questions

How many 15-letter words matching _r_a___________ are there?

14. 4 of them are common words.

What is a common example?

IRRATIONALITIES is among the common words in this set.