vegetable vs cardoon

vegetable and cardoon both are nouns.

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

As nouns, cardoon is a hyponym of vegetable; that is, cardoon 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
cardoon: only parts eaten are roots and especially stalks (blanched and used as celery); related to artichokes

As nouns, cardoon is a hyponym of vegetable; that is, cardoon 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
cardoon: southern European plant having spiny leaves and purple flowers cultivated for its edible leafstalks and roots

vegetable (noun)	cardoon (noun)
edible seeds or roots or stems or leaves or bulbs or tubers or nonsweet fruits of any of numerous herbaceous plant	only parts eaten are roots and especially stalks (blanched and used as celery); related to artichokes
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	southern European plant having spiny leaves and purple flowers cultivated for its edible leafstalks and roots