13-Letter Words Matching _________FI__

There are 20 13-letter words that match _________FI__. 7 are common words, such as CHILDPROOFING and FLAMEPROOFING. A rarer one is UNELECTRIFIED. In this set, E is the most frequent open letter (18 words). 10 words contain a doubled letter.

Full list 20

childproofingflameproofingmisidentifiedmisidentifiesoverqualifiedsoundproofingwaterproofingmisclassifiedoverspecifiedoverspecifiesmisclassifiesnonclassifiednonesterifiedoveramplifiedpresanctifiedsubclassifiedsubclassifiesultrararefiedunderstaffingunelectrified

About this list

Words
20 (7 common words)
Common example
childproofing
Rare example
unelectrified
Doubled letters
10
Ending in S
4
Most frequent letter
E (18)

Questions

How many 13-letter words matching _________fi__ are there?

20. 7 of them are common words.

What is a common example?

CHILDPROOFING is among the common words in this set.