Answer:
Substance: Something that has only 1 atom, for example; Water.
Matter: Made up of more than 1 atom, example; Humans
Explanation:
As said a substance is something that has only 1 atom like water or tin.
Matter is well almost everything in the universe, there's a reason some people say; This is Human Matter. I'm pretty sure it's somewhere in the bible too.
If you were to search it up the other persons answer would come up
