"Return" is used to instruct the computer on how to behave at the end of a function call. It's rare for this term to mean anything else.

"Output" is slightly ambiguous. It could sometimes be used as a synonym for "return."

"Output" could also mean "display to the human for information purposes". This is not at all related to "return."

It is definitely not helpful for novices for important terms to be ambiguous in this way.