Unscramble Itfsset

What is the meaning of word itfsset unscrambled?

What 7 letter words can be made from letters I T F S S E T:

Make more words by adding or removing letters

How many 6 letter words can you make from letters I T F S S E T?

1. feists - Definition of feists

2. testis - Definition of testis

Which 6 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter I and unscrambling tfsset
2) Removing the letter T and unscrambling ifsset
3) Removing the letter F and unscrambling itsset
4) Removing the letter S and unscrambling itfset
5) Removing the letter S and unscrambling itfset
6) Removing the letter E and unscrambling itfsst
7) Removing the letter T and unscrambling itfsse

More anagrams containing the letters I T F S S E T
itfsste itfstes ftetsis stfitse