meat vs red meat

meat and red meat both are nouns.

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

As nouns, red meat is a hyponym of meat; that is, red meat is a word with a more specific, narrower meaning than meat:

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

meat (noun)	red meat (noun)
the choicest or most essential or most vital part of some idea or experience	meat that is dark in color before cooking (as beef, venison, lamb, mutton)
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