celery vs veggie

celery and veggie both are nouns.

Word	Noun	Adjective	Verb	Adverb
celery	Yes	No	No	No
veggie	Yes	No	No	No

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

celery: stalks eaten raw or cooked or used as seasoning
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 celery include veg, vegetable.

celery (noun)	veggie (noun)
stalks eaten raw or cooked or used as seasoning	edible seeds or roots or stems or leaves or bulbs or tubers or nonsweet fruits of any of numerous herbaceous plant
widely cultivated herb with aromatic leaf stalks that are eaten raw or cooked