ready-mix vs convenience food

ready-mix and convenience food both are nouns.

Word	Noun	Adjective	Verb	Adverb
ready-mix	Yes	No	No	No
convenience food	Yes	No	No	No

As nouns, convenience food is a hypernym of ready-mix; that is, convenience food is a word with a broader meaning than ready-mix:

ready-mix: a commercial preparation containing most of the ingredients for a dish
convenience food: any packaged dish or food that can be prepared quickly and easily as by thawing or heating

Other hypernyms of ready-mix include mix, premix.

ready-mix (noun)	convenience food (noun)
a commercial preparation containing most of the ingredients for a dish	any packaged dish or food that can be prepared quickly and easily as by thawing or heating