Unscramble Usins

What is the meaning of word usins unscrambled?

What 5 letter words can be made from letters U S I N S:

1. nisus - Definition of nisus

2. sinus - Definition of sinus

Make more words by adding or removing letters

How many 4 letter words can you make from letters U S I N S?

1. sins - Definition of sins

2. suns - Definition of suns

Which 4 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter U and unscrambling sins
2) Removing the letter S and unscrambling uins
3) Removing the letter I and unscrambling usns
4) Removing the letter N and unscrambling usis
5) Removing the letter S and unscrambling usin

More anagrams containing the letters U S I N S
usisn usnis niuss usnsi