15-Letter Words Matching _R_G___________

There are 12 15-letter words that match _R_G___________. 6 are common words, such as FRIGHTFULNESSES and PROGNOSTICATING. A rarer one is PROGRESSIVISTIC. In this set, I is the most frequent open letter (12 words). 6 words contain a doubled letter.

Full list 12

frightfulnessesprognosticatingprognosticationprognosticatorsprogressivenesstrigonometricalprognosticatoryprogrammabilityprogressivitiesfragmentarinessprognosticativeprogressivistic

About this list

Words
12 (6 common words)
Common example
frightfulnesses
Rare example
progressivistic
Doubled letters
6
Ending in S
5
Most frequent letter
I (12)

Questions

How many 15-letter words matching _r_g___________ are there?

12. 6 of them are common words.

What is a common example?

FRIGHTFULNESSES is among the common words in this set.