cruciferous vegetable vs veggie

cruciferous vegetable and veggie both are nouns.

Word	Noun	Adjective	Verb	Adverb
cruciferous vegetable	Yes	No	No	No
veggie	Yes	No	No	No

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

cruciferous vegetable: a vegetable of the mustard family: especially mustard greens, various cabbages, broccoli, cauliflower, brussels sprouts
veggie: edible seeds or roots or stems or leaves or bulbs or tubers or nonsweet fruits of any of numerous herbaceous plant

Other hypernyms of cruciferous vegetable include veg, vegetable.

cruciferous vegetable (noun)	veggie (noun)
a vegetable of the mustard family: especially mustard greens, various cabbages, broccoli, cauliflower, brussels sprouts	edible seeds or roots or stems or leaves or bulbs or tubers or nonsweet fruits of any of numerous herbaceous plant