cereal vs food product

cereal and food product both are nouns.

Word	Noun	Adjective	Verb	Adverb
cereal	Yes	Yes	No	No
food product	Yes	No	No	No

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

Other hypernyms of cereal include foodstuff.

cereal (noun)	food product (noun)
a breakfast food prepared from grain	a substance that can be used or prepared for use as food
foodstuff prepared from the starchy grains of cereal grasses
grass whose starchy grains are used as food: wheat, rice, rye, oats, maize, buckwheat, millet

cereal (adjective)	food product (adjective)
made of grain or relating to grain or the plants that produce it