15-Letter Words Matching ___R_G_________

There are 12 15-letter words that match ___R_G_________. 3 are common words, such as NITROGLYCERINES and PREREGISTRATION. A rarer one is TETRAGRAMMATONS. In this set, E is the most frequent open letter (12 words). 5 words contain a doubled letter.

Full list 12

nitroglycerinespreregistrationsegregationistsretrogressivelyaggregatenessescorrigibilitiesimpregnablenessmicrogametocytemisregistrationretrogradationssaprogenicitiestetragrammatons

About this list

Words
12 (3 common words)
Common example
nitroglycerines
Rare example
tetragrammatons
Doubled letters
5
Ending in S
8
Most frequent letter
E (12)

Questions

How many 15-letter words matching ___r_g_________ are there?

12. 3 of them are common words.

What is a common example?

NITROGLYCERINES is among the common words in this set.