vegetable vs artichoke

vegetable and artichoke both are nouns.

Word	Noun	Adjective	Verb	Adverb
vegetable	Yes	No	No	No
artichoke	Yes	No	No	No

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

vegetable: edible seeds or roots or stems or leaves or bulbs or tubers or nonsweet fruits of any of numerous herbaceous plant
artichoke: a thistlelike flower head with edible fleshy leaves and heart

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

vegetable: any of various herbaceous plants cultivated for an edible part such as the fruit or the root of the beet or the leaf of spinach or the seeds of bean plants or the flower buds of broccoli or cauliflower
artichoke: Mediterranean thistlelike plant widely cultivated for its large edible flower head

vegetable (noun)	artichoke (noun)
edible seeds or roots or stems or leaves or bulbs or tubers or nonsweet fruits of any of numerous herbaceous plant	a thistlelike flower head with edible fleshy leaves and heart
any of various herbaceous plants cultivated for an edible part such as the fruit or the root of the beet or the leaf of spinach or the seeds of bean plants or the flower buds of broccoli or cauliflower	Mediterranean thistlelike plant widely cultivated for its large edible flower head