Unscramble Lfsr

What is the meaning of word lfsr unscrambled?

What 4 letter words can be made from letters L F S R:

Make more words by adding or removing letters

How many 3 letter words can you make from letters L F S R?

1. FRS - Definition of FRS

2. SLR - Definition of SLR

Which 3 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter L and unscrambling fsr
2) Removing the letter F and unscrambling lsr
3) Removing the letter S and unscrambling lfr
4) Removing the letter R and unscrambling lfs

More anagrams containing the letters L F S R
lrfs lrsf frls sflr