"Goodbye" is an interjection which is often translated as "adiós", and "see you later" is a phrase which is often translated as "hasta luego". Learn more about the difference between "goodbye" and "see you later" below.
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An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g. Wow!).
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).