11-Letter Words Matching ____R_F____

There are 23 11-letter words that match ____R_F____. 8 are common words, such as AFTEREFFECT and CENTRIFUGAL. A rarer one is REVERIFYING. 6 words contain a doubled letter.

Full list 23

aftereffectcentrifugalcentrifugedcentrifugeschloroformsgentrifyinginterofficeoverrefinedaircraftmanaircraftmencontraflowsesterifyingetherifyingcopurifyingeffortfullygentrifiersisograftingmisgraftingoverruffingquatrefoilsregardfullyrepurifyingreverifying

About this list

Words
23 (8 common words)
Common example
aftereffect
Rare example
reverifying
Doubled letters
6
Ending in S
5

Questions

How many 11-letter words matching ____r_f____ are there?

23. 8 of them are common words.

What is a common example?

AFTEREFFECT is among the common words in this set.