shallot vs onion plant

shallot and onion plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
shallot	Yes	No	No	No
onion plant	Yes	No	No	No

As nouns, onion plant is a hypernym of shallot; that is, onion plant is a word with a broader meaning than shallot:

shallot: type of onion plant producing small clustered mild-flavored bulbs used as seasoning
onion plant: bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb

Other hypernyms of shallot include Allium cepa, onion.

shallot (noun)	onion plant (noun)
small mild-flavored onion-like or garlic-like clustered bulbs used for seasoning	bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb
type of onion plant producing small clustered mild-flavored bulbs used as seasoning
aggregate bulb of the multiplier onion