Unscramble Setdiff

What is the meaning of word setdiff unscrambled?

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

1. stiffed - Definition of stiffed

Make more words by adding or removing letters

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

1. fisted - Definition of fisted

2. sifted - Definition of sifted

3. tiffed - Definition of tiffed

Which 6 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter S and unscrambling etdiff
2) Removing the letter E and unscrambling stdiff
3) Removing the letter T and unscrambling sediff
4) Removing the letter D and unscrambling setiff
5) Removing the letter I and unscrambling setdff
6) Removing the letter F and unscrambling setdif
7) Removing the letter F and unscrambling setdif

More anagrams containing the letters S E T D I F F
setfdfi setfdif sfdfeit ifdfets