13-Letter Words Matching ____R___R____

There are 52 13-letter words that match ____R___R____. 20 are common words, such as CHLOROFORMING and CONFRATERNITY. A rarer one is UNDERSHERIFFS. In this set, E is the most frequent open letter (48 words). 9 words contain a doubled letter.

Full list 52

Common words

chloroformingconfraternitycontroversialcontroversiescontrovertingdisproportionfluorocarbonshyperthyroidsintermarriageintermarryinginterspersinginterspersion
chloroformingconfraternitycontroversialcontroversiescontrovertingdisproportionfluorocarbonshyperthyroidsintermarriageintermarryinginterspersinginterspersioninvertebratessuperchargerssuperchargingundercarriageunderchargingundercurrentsveterinarianswaterboardingcopartnershipenterovirusesheteromorphichypermetropiahyperthermiasinteroperableinteroperatesmajoritariansquadripartitearteriographycamerapersonscontrovertersdumortieritesfluorochromesheterokaryonshyperhidroseshyperhidrosishypermetricalhypermetropicinterneuronalisoproterenolmoderatorshipnongregariousoverreportingsclerodermatasupercarrierssuperchurchessupercurrentssuperpatriotssuperstardomssuperterrificundersheriffs

About this list

Words
52 (20 common words)
Common example
chloroforming
Rare example
undersheriffs
Doubled letters
9
Ending in S
25
Most frequent letter
E (48)

Questions

How many 13-letter words matching ____r___r____ are there?

52. 20 of them are common words.

What is a common example?

CHLOROFORMING is among the common words in this set.