veg vs leafy vegetable

veg and leafy vegetable both are nouns.

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

As nouns, leafy vegetable is a hyponym of veg; that is, leafy vegetable is a word with a more specific, narrower meaning than veg:

veg: edible seeds or roots or stems or leaves or bulbs or tubers or nonsweet fruits of any of numerous herbaceous plant
leafy vegetable: any of various leafy plants or their leaves and stems eaten as vegetables

veg (noun)	leafy vegetable (noun)
edible seeds or roots or stems or leaves or bulbs or tubers or nonsweet fruits of any of numerous herbaceous plant	any of various leafy plants or their leaves and stems eaten as vegetables