meal vs nutrition

meal and nutrition both are nouns.

Word	Noun	Adjective	Verb	Adverb
meal	Yes	No	No	No
nutrition	Yes	No	No	No

As nouns, nutrition is a hypernym of meal; that is, nutrition is a word with a broader meaning than meal:

Other hypernyms of meal include aliment, alimentation, nourishment, nutriment, sustenance, victuals.

meal (noun)	nutrition (noun)
the food served and eaten at one time	the scientific study of food and drink (especially in humans)
coarsely ground foodstuff; especially seeds of various cereal grasses or pulse	a source of materials to nourish the body
any of the occasions for eating food that occur by custom or habit at more or less fixed times	(physiology) the organic process of nourishing or being nourished; the processes by which an organism assimilates food and uses it for growth and maintenance