sea onion vs sea squill

sea onion and sea squill both are nouns.

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

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

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

Other synonyms of sea onion include squill, Urginea maritima.

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