Unscramble Istft

What is the meaning of word istft unscrambled?

What 5 letter words can be made from letters I S T F T:

Make more words by adding or removing letters

How many 4 letter words can you make from letters I S T F T?

1. fist - Definition of fist

2. fits - Definition of fits

3. sift - Definition of sift

4. tits - Definition of tits

Which 4 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter I and unscrambling stft
2) Removing the letter S and unscrambling itft
3) Removing the letter T and unscrambling isft
4) Removing the letter F and unscrambling istt
5) Removing the letter T and unscrambling istf

More anagrams containing the letters I S T F T
isttf itfst sftti fttsi