nutrition vs repast

nutrition and repast both are nouns.

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

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

nutrition (noun)	repast (noun)
the scientific study of food and drink (especially in humans)	the food served and eaten at one time
a source of materials to nourish the body
(physiology) the organic process of nourishing or being nourished; the processes by which an organism assimilates food and uses it for growth and maintenance