Allium cepa viviparum vs tree onion

Allium cepa viviparum and tree onion both are nouns.

Word	Noun	Adjective	Verb	Adverb
Allium cepa viviparum	Yes	No	No	No
tree onion	Yes	No	No	No

As nouns, Allium cepa viviparum and tree onion are synonyms defined as:

Allium cepa viviparum and tree onion: type of perennial onion grown chiefly as a curiosity or for early salad onions; having bulbils that replace the flowers

Other synonyms of Allium cepa viviparum include Egyptian onion, top onion.

Allium cepa viviparum (noun)	tree onion (noun)
type of perennial onion grown chiefly as a curiosity or for early salad onions; having bulbils that replace the flowers	type of perennial onion grown chiefly as a curiosity or for early salad onions; having bulbils that replace the flowers