meat loaf vs loaf of bread

meat loaf and loaf of bread both are nouns.

Word	Noun	Adjective	Verb	Adverb
meat loaf	Yes	No	No	No
loaf of bread	Yes	No	No	No

As nouns, loaf of bread is a hypernym of meat loaf; that is, loaf of bread is a word with a broader meaning than meat loaf:

meat loaf: a baked loaf of ground meat
loaf of bread: a shaped mass of baked bread that is usually sliced before eating

Other hypernyms of meat loaf include dish, loaf.

meat loaf (noun)	loaf of bread (noun)
a baked loaf of ground meat	a shaped mass of baked bread that is usually sliced before eating