Unscramble Libsref

What is the meaning of word libsref unscrambled?

What 7 letter words can be made from letters L I B S R E F:

Make more words by adding or removing letters

How many 6 letter words can you make from letters L I B S R E F?

1. birles - Definition of birles

2. briefs - Definition of briefs

3. fibers - Definition of fibers

4. fibres - Definition of fibres

5. filers - Definition of filers

6. fliers - Definition of fliers

7. libers - Definition of libers

8. lifers - Definition of lifers

9. rifles - Definition of rifles

Which 6 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter L and unscrambling ibsref
2) Removing the letter I and unscrambling lbsref
3) Removing the letter B and unscrambling lisref
4) Removing the letter S and unscrambling libref
5) Removing the letter R and unscrambling libsef
6) Removing the letter E and unscrambling libsrf
7) Removing the letter F and unscrambling libsre

More anagrams containing the letters L I B S R E F
libsrfe liebfrs sebfilr sefrbil