meat vs nitty-gritty

meat and nitty-gritty both are nouns.

Word	Noun	Adjective	Verb	Adverb
meat	Yes	No	No	No
nitty-gritty	Yes	No	No	No

As nouns, meat and nitty-gritty are synonyms defined as:

meat and nitty-gritty: the choicest or most essential or most vital part of some idea or experience

meat (noun)	nitty-gritty (noun)
the choicest or most essential or most vital part of some idea or experience	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