Unscramble Xref

What is the meaning of word xref unscrambled?

What 4 letter words can be made from letters X R E F:

Make more words by adding or removing letters

How many 3 letter words can you make from letters X R E F?

1. fer - Definition of fer

2. ref - Definition of ref

3. Rex - Definition of Rex

Which 3 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter X and unscrambling ref
2) Removing the letter R and unscrambling xef
3) Removing the letter E and unscrambling xrf
4) Removing the letter F and unscrambling xre

More anagrams containing the letters X R E F
xrfe efrx rfex exfr