13-Letter Words Containing FFI

There are 20 13-letter words that contain FFI. 12 are common words, such as AFFIRMATIVELY and DISAFFILIATED. A rarer one is UNDERSTAFFING. In this set, E is the most frequent open letter (16 words). 20 words contain a doubled letter.

Full list 20

affirmativelydisaffiliateddisaffiliatesefficaciouslyinefficientlyinsufficiencyofficeholdersofficiousnessraffishnessesreaffirmationscruffinessessufficienciescycloparaffininefficaciousnitroparaffinnonofficiallydisaffirmancenonaffiliatedstandoffishlyunderstaffing

About this list

Words
20 (12 common words)
Common example
affirmatively
Rare example
understaffing
Doubled letters
20
Ending in S
7
Most frequent letter
E (16)

Questions

How many 13-letter words containing ffi are there?

20. 12 of them are common words.

What is a common example?

AFFIRMATIVELY is among the common words in this set.