15-Letter Words Matching _____F__T______

There are 12 15-letter words that match _____F__T______. 4 are common words, such as COLORFASTNESSES and IMPERFECTNESSES. A rarer one is ULTRAFILTRATION. 5 words contain a doubled letter.

Full list 12

colorfastnessesimperfectnessesnoninflationarysteadfastnessesdisinfestationsdisinflationaryhyperfastidiousinterfraternitylightfastnessestightfistednessultrafastidiousultrafiltration

About this list

Words
12 (4 common words)
Common example
colorfastnesses
Rare example
ultrafiltration
Doubled letters
5
Ending in S
8

Questions

How many 15-letter words matching _____f__t______ are there?

12. 4 of them are common words.

What is a common example?

COLORFASTNESSES is among the common words in this set.