Unscramble Irrfts

What is the meaning of word irrfts unscrambled?

What 6 letter words can be made from letters I R R F T S:

Make more words by adding or removing letters

How many 5 letter words can you make from letters I R R F T S?

1. first - Definition of first

2. frits - Definition of frits

3. rifts - Definition of rifts

Which 5 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter I and unscrambling rrfts
2) Removing the letter R and unscrambling irfts
3) Removing the letter R and unscrambling irfts
4) Removing the letter F and unscrambling irrts
5) Removing the letter T and unscrambling irrfs
6) Removing the letter S and unscrambling irrft

More anagrams containing the letters I R R F T S
irrsft irrstf trrisf frstir