Unscramble Idefs

What is the meaning of word idefs unscrambled?

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

1. defis - Definition of defis

Make more words by adding or removing letters

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

1. defi - Definition of defi

2. desi - Definition of desi

3. dies - Definition of dies

4. difs - Definition of difs

5. feds - Definition of feds

6. fids - Definition of fids

7. ides - Definition of ides

8. seif - Definition of seif

9. side - Definition of side

Which 4 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter I and unscrambling defs
2) Removing the letter D and unscrambling iefs
3) Removing the letter E and unscrambling idfs
4) Removing the letter F and unscrambling ides
5) Removing the letter S and unscrambling idef

More anagrams containing the letters I D E F S
idesf idfes idfes efsdi