11-Letter Words Matching ______RF___

There are 13 11-letter words that match ______RF___. 4 are common words, such as COUNTERFEIT and COUNTERFOIL. A rarer one is TUMBLERFULS. In this set, U is the most frequent open letter (12 words). 3 words contain a doubled letter.

Full list 13

counterfeitcounterfoilwindsurferswindsurfingpitcherfulstriggerfishbodysurfersbodysurfingcounterfirecounterflowdropperfulsplatterfulstumblerfuls

About this list

Words
13 (4 common words)
Common example
counterfeit
Rare example
tumblerfuls
Doubled letters
3
Ending in S
6
Most frequent letter
U (12)

Questions

How many 11-letter words matching ______rf___ are there?

13. 4 of them are common words.

What is a common example?

COUNTERFEIT is among the common words in this set.