15-Letter Words Matching _____F______S__

There are 13 15-letter words that match _____F______S__. 7 are common words, such as COLORFASTNESSES and DISENFRANCHISED. A rarer one is MATERFAMILIASES. In this set, S is the most frequent open letter (13 words). 7 words contain a doubled letter.

Full list 13

colorfastnessesdisenfranchiseddisenfranchisesimperfectnessespaterfamiliasessteadfastnessesunselfishnessesariboflavinosesariboflavinosisindifferentismsindifferentistslightfastnessesmaterfamiliases

About this list

Words
13 (7 common words)
Common example
colorfastnesses
Rare example
materfamiliases
Doubled letters
7
Ending in S
12
Most frequent letter
S (13)

Questions

How many 15-letter words matching _____f______s__ are there?

13. 7 of them are common words.

What is a common example?

COLORFASTNESSES is among the common words in this set.