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"Sir" is a form of "sir", a noun which is often translated as "el señor". "Good morning" is a form of "good morning", a phrase which is often translated as "buenos días". Learn more about the difference between "sir" and "good morning" below.
sir()
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
good morning()
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (salutation)
