Noun Classes

Are nouns just determined what class they are? Like each noun is a certain class by by his nature, or could you use them like say if you're talking about grain of sand. I don't think I've invented the word sand yet. Maybe the weird distinction is because I use a lot of different sort of cut up points and the interacting weird ways. Now, you sort of expect weird interactions to happen once you have multiple classes of nouns,. I can't imagine how you would avoid it. It's just an innate property of the noun. But well, it'll influence morphology and derivational morphology. Do you have any agreement with nouns? Yeah. The only place I