What are the differences and similarities between moss and grass?

so grass is just like the just grass, u see it in fields, ur front/back lawn, basically everywhere, and moss is kinda like grass but stuck in like a ball sometimes, or grass just in the form of a ball and kinda squishy, or u see it stuck to the top of rocks sometimes, it's like a type of fungus, emphasize the word like

it cools slower in the earth meaning the crystals have more time to form than lava on the surface