sprout vs leafy vegetable

sprout and leafy vegetable both are nouns.

Word	Noun	Adjective	Verb	Adverb
sprout	Yes	No	Yes	No
leafy vegetable	Yes	No	No	No

As nouns, leafy vegetable is a hypernym of sprout; that is, leafy vegetable is a word with a broader meaning than sprout:

sprout: a newly grown bud (especially from a germinating seed)
leafy vegetable: any of various leafy plants or their leaves and stems eaten as vegetables

Other hypernyms of sprout include green, greens.

sprout (noun)	leafy vegetable (noun)
a newly grown bud (especially from a germinating seed)	any of various leafy plants or their leaves and stems eaten as vegetables
any new growth of a plant such as a new branch or a bud

sprout (verb)	leafy vegetable (verb)
put forth and grow sprouts or shoots
produce buds, branches, or germinate