13-Letter Words Matching ____R_G______

There are 27 13-letter words that match ____R_G______. 3 are common words, such as CONGREGATIONS and HETEROGENEITY. A rarer one is TUMORIGENESIS. In this set, O is the most frequent open letter (26 words). 7 words contain a doubled letter.

Full list 27

Common words

congregationsheterogeneityheterogeneouscopyrightabledextroglucoseheterogenesesheterogenesisheterogeneticoverrighteousatherogenesesatherogenesisdownrightness
congregationsheterogeneityheterogeneouscopyrightabledextroglucoseheterogenesesheterogenesisheterogeneticoverrighteousatherogenesesatherogenesisdownrightnessfluorographicheterogametesheterogameticmisprogramingmisprogrammednongregariousnonprogrammeroverregulatedoverregulatespolarographicpreprogramingpreprogrammedsuperagenciestumorigenesestumorigenesis

About this list

Words
27 (3 common words)
Common example
congregations
Rare example
tumorigenesis
Doubled letters
7
Ending in S
14
Most frequent letter
O (26)

Questions

How many 13-letter words matching ____r_g______ are there?

27. 3 of them are common words.

What is a common example?

CONGREGATIONS is among the common words in this set.