10-Letter Words Containing STF

There are 13 10-letter words that contain STF. 4 are common words, such as BOASTFULLY and FISTFIGHTS. A rarer one is TRISTFULLY. In this set, L is the most frequent open letter (8 words). 7 words contain a doubled letter.

Full list 13

boastfullyfistfightsrestfullertrustfullybreastfeeddisgustfuluntrustfulghastfullypostfixingpostflightpostformedpostfreezetristfully

About this list

Words
13 (4 common words)
Common example
boastfully
Rare example
tristfully
Doubled letters
7
Ending in S
1
Most frequent letter
L (8)

Questions

How many 10-letter words containing stf are there?

13. 4 of them are common words.

What is a common example?

BOASTFULLY is among the common words in this set.