First off, let me tell you that "grass" can be used as both a singular and a plural noun. For example, if you were talking about a single blade of grass, you could say "look at that blade of grass." However, if you were referring to a group of blades of grass, you could say "look at all the grass."
Now, if you wanted to specifically indicate multiple types of grass, you could use the word "grasses." This would imply that there are multiple species or varieties of grass that you are referring to. For example, a botanist might say "the prairie is home to many different grasses," to indicate that there are a variety of grass species present.
So, to sum it up, "grass" can function as either a singular or plural noun, and if you want to make it clear that you are referring to multiple species of grass, you can use the word "grasses."
I hope that helps! Let me know if you have any other language questions.
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