15-Letter Words Matching __F________T___

There are 18 15-letter words that match __F________T___. 5 are common words, such as DIFFERENTIATING and DIFFERENTIATION. A rarer one is REFUNDABILITIES. In this set, I is the most frequent open letter (18 words). 8 words contain a doubled letter.

Full list 18

differentiatingdifferentiationinfallibilitiesinflexibilitiesunfamiliaritiesdifferentiatorsaffectabilitiesaffordabilitiesanfractuositiesdefeasibilitiesdefensibilitiesdiffractometersdiffractometricinfantilizationinfeasibilitiesreformabilitiesrefortificationrefundabilities

About this list

Words
18 (5 common words)
Common example
differentiating
Rare example
refundabilities
Doubled letters
8
Ending in S
13
Most frequent letter
I (18)

Questions

How many 15-letter words matching __f________t___ are there?

18. 5 of them are common words.

What is a common example?

DIFFERENTIATING is among the common words in this set.