12-Letter Words Containing IFF

There are 19 12-letter words that contain IFF. 6 are common words, such as CLIFFHANGERS and DIFFERENTIAL. A rarer one is SPIFFINESSES. In this set, N is the most frequent open letter (15 words). 19 words contain a doubled letter.

Full list 19

cliffhangersdifferentialdifficultiesdiffractionsindifferencewhiffletreescliffhangingdifferencingdifferentiaeundersheriffbailiffshipsbullmastiffsdiffusionismdiffusionistindifferencyinterdiffusesniffinessessniffishnessspiffinesses

About this list

Words
19 (6 common words)
Common example
cliffhangers
Rare example
spiffinesses
Doubled letters
19
Ending in S
9
Most frequent letter
N (15)

Questions

How many 12-letter words containing iff are there?

19. 6 of them are common words.

What is a common example?

CLIFFHANGERS is among the common words in this set.