Unscramble Itsrref

What is the meaning of word itsrref unscrambled?

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

Make more words by adding or removing letters

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

1. firers - Definition of firers

2. friers - Definition of friers

3. frites - Definition of frites

4. refits - Definition of refits

5. resift - Definition of resift

6. rifest - Definition of rifest

7. sifter - Definition of sifter

8. strife - Definition of strife

9. triers - Definition of triers

Which 6 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter I and unscrambling tsrref
2) Removing the letter T and unscrambling isrref
3) Removing the letter S and unscrambling itrref
4) Removing the letter R and unscrambling itsref
5) Removing the letter R and unscrambling itsref
6) Removing the letter E and unscrambling itsrrf
7) Removing the letter F and unscrambling itsrre

More anagrams containing the letters I T S R R E F
itsrrfe refirst trsirfe frirtse