13-Letter Words Matching ____R__G_____

There are 23 13-letter words that match ____R__G_____. 10 are common words, such as CLEARINGHOUSE and INTERROGATING. A rarer one is SUPERREGIONAL. 12 words contain a doubled letter.

Full list 23

clearinghouseinterrogatinginterrogationinterrogativeinterrogatorsinterrogatoryrearrangementrestrengthenssovereigntiessuperhighwaysastereognosisinterdigitateairfreightingarteriographyhypervigilantincorrigiblesinterregionalinterrogateesintersegmentssubirrigatingsubirrigationsuperorganismsuperregional

About this list

Words
23 (10 common words)
Common example
clearinghouse
Rare example
superregional
Doubled letters
12
Ending in S
8

Questions

How many 13-letter words matching ____r__g_____ are there?

23. 10 of them are common words.

What is a common example?

CLEARINGHOUSE is among the common words in this set.