red meat vs meat

red meat and meat both are nouns.

Word	Noun	Adjective	Verb	Adverb
red meat	Yes	No	No	No
meat	Yes	No	No	No

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

red meat: meat that is dark in color before cooking (as beef, venison, lamb, mutton)
meat: the flesh of animals (including fishes and birds and snails) used as food

red meat (noun)	meat (noun)
meat that is dark in color before cooking (as beef, venison, lamb, mutton)	the choicest or most essential or most vital part of some idea or experience
	the flesh of animals (including fishes and birds and snails) used as food
	the inner and usually edible part of a seed or grain or nut or fruit stone