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QUICK ANSWER
"Sir" is a form of "sir", a noun which is often translated as "el señor". "What color" is a phrase which is often translated as "qué color". Learn more about the difference between "sir" and "what color" below.
sir()
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
what color()
A phrase is a group of words commonly used together (e.g., once upon a time).
a. qué color
What color do you like more? - I like that red a lot.¿Qué color te gusta más? - Ese rojo me gusta mucho.
