13-Letter Words Containing IFF

There are 14 13-letter words that contain IFF. 5 are common words, such as DIFFERENTIALS and DIFFERENTIATE. A rarer one is UNDERSHERIFFS. In this set, D is the most frequent open letter (14 words). 14 words contain a doubled letter.

Full list 14

differentialsdifferentiatediffusenessesindifferencesindifferentlydifferentnessdiffusionismsdiffusionistsdiffusivenessdiffusivitiesinterdiffusedinterdiffusesnondiffusibleundersheriffs

About this list

Words
14 (5 common words)
Common example
differentials
Rare example
undersheriffs
Doubled letters
14
Ending in S
10
Most frequent letter
D (14)

Questions

How many 13-letter words containing iff are there?

14. 5 of them are common words.

What is a common example?

DIFFERENTIALS is among the common words in this set.