It depend entirely on the expressions you are comparing.
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like terms
They are known as like terms.
A polynomial term is a product of a number and one or more variables raised to various powers. The powers must be non-negative integers.
In such cases, typicall different variables appear raised to different powers. You choose the smallest of such powers. If a variable only appears in one of the two expressions, you don't include it at all.
They are called "like terms".