butter vs solid food

butter and solid food both are nouns.

Word	Noun	Adjective	Verb	Adverb
butter	Yes	No	Yes	No
solid food	Yes	No	No	No

As nouns, solid food is a hypernym of butter; that is, solid food is a word with a broader meaning than butter:

butter: an edible emulsion of fat globules made by churning milk or cream; for cooking and table use
solid food: any solid substance (as opposed to liquid) that is used as a source of nourishment

Other hypernyms of butter include food, dairy product.

butter (noun)	solid food (noun)
an edible emulsion of fat globules made by churning milk or cream; for cooking and table use	any solid substance (as opposed to liquid) that is used as a source of nourishment
a fighter who strikes the opponent with his head

butter (verb)	solid food (verb)
spread butter on