meatloaf vs fish loaf

meatloaf and fish loaf both are nouns.

Word	Noun	Adjective	Verb	Adverb
meatloaf	Yes	No	No	No
fish loaf	Yes	No	No	No

As nouns, fish loaf is a hyponym of meatloaf; that is, fish loaf is a word with a more specific, narrower meaning than meatloaf:

meatloaf: a baked loaf of ground meat
fish loaf: flaked fish baked in a loaf with bread crumbs and various seasonings

meatloaf (noun)	fish loaf (noun)
a baked loaf of ground meat	flaked fish baked in a loaf with bread crumbs and various seasonings