sea squill vs sea onion

sea squill and sea onion both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea squill	Yes	No	No	No
sea onion	Yes	No	No	No

As nouns, sea squill and sea onion are synonyms defined as:

sea squill and sea onion: having dense spikes of small white flowers and yielding a bulb with medicinal properties

Other synonyms of sea squill include squill, Urginea maritima.

sea squill (noun)	sea onion (noun)
having dense spikes of small white flowers and yielding a bulb with medicinal properties	European scilla with small blue or purple flowers
	having dense spikes of small white flowers and yielding a bulb with medicinal properties