butter vs brown butter

butter and brown butter both are nouns.

Word	Noun	Adjective	Verb	Adverb
butter	Yes	No	Yes	No
brown butter	Yes	No	No	No

As nouns, brown butter is a hyponym of butter; that is, brown butter is a word with a more specific, narrower meaning than butter:

butter: an edible emulsion of fat globules made by churning milk or cream; for cooking and table use
brown butter: clarified butter browned slowly and seasoned with vinegar or lemon juice and capers

butter (noun)	brown butter (noun)
an edible emulsion of fat globules made by churning milk or cream; for cooking and table use	clarified butter browned slowly and seasoned with vinegar or lemon juice and capers
a fighter who strikes the opponent with his head

butter (verb)	brown butter (verb)
spread butter on