"Good night" is a phrase which is often translated as "buenas noches", and "thanks" is an interjection which is often translated as "gracias". Learn more about the difference between "good night" and "thanks" below.
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An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g. Wow!).
1. (expressing gratitude)
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
2. (expression of gratitude)