Unscramble Isssum

What is the meaning of word isssum unscrambled?

What 6 letter words can be made from letters I S S S U M:

1. missus - Definition of missus

Make more words by adding or removing letters

How many 5 letter words can you make from letters I S S S U M?

1. Issus - Definition of Issus

2. sissu - Definition of sissu

Which 5 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter I and unscrambling sssum
2) Removing the letter S and unscrambling issum
3) Removing the letter S and unscrambling issum
4) Removing the letter S and unscrambling issum
5) Removing the letter U and unscrambling isssm
6) Removing the letter M and unscrambling isssu

More anagrams containing the letters I S S S U M
issums issusm usissm usmiss