Question: Extracting terms with a certain dependence

Is there a way of extracting the terms of an expression with a certain dependence?

For example:

If I have,

expression:=f(x)+g(y)+x^2+y^3+65

I need to have,

f(x)+x^2
g(y)+y^3
65

parts separately.

(Of course, a way other than taking derivative.)

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