Unscramble Sfnr

What is the meaning of word sfnr unscrambled?

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

Make more words by adding or removing letters

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

1. FRS - Definition of FRS

2. NSF - Definition of NSF

Which 3 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter S and unscrambling fnr
2) Removing the letter F and unscrambling snr
3) Removing the letter N and unscrambling sfr
4) Removing the letter R and unscrambling sfn

More anagrams containing the letters S F N R
sfrn snfr rnfs snrf