oil cake vs oil meal

oil cake and oil meal both are nouns.

Word	Noun	Adjective	Verb	Adverb
oil cake	Yes	No	No	No
oil meal	Yes	No	No	No

As nouns, oil meal is a hyponym of oil cake; that is, oil meal is a word with a more specific, narrower meaning than oil cake:

oil cake: mass of e.g. linseed or cottonseed or soybean from which the oil has been pressed; used as food for livestock
oil meal: ground oil cake

oil cake (noun)	oil meal (noun)
mass of e.g. linseed or cottonseed or soybean from which the oil has been pressed; used as food for livestock	ground oil cake