squill vs Scilla verna

squill and Scilla verna both are nouns.

Word	Noun	Adjective	Verb	Adverb
squill	Yes	No	No	No
Scilla verna	Yes	No	No	No

As nouns, Scilla verna is a hyponym of squill; that is, Scilla verna is a word with a more specific, narrower meaning than squill:

squill: an Old World plant of the genus Scilla having narrow basal leaves and pink or blue or white racemose flowers
Scilla verna: European scilla with small blue or purple flowers

Other hyponyms of squill include sea onion, spring squill.

squill (noun)	Scilla verna (noun)
an Old World plant of the genus Scilla having narrow basal leaves and pink or blue or white racemose flowers	European scilla with small blue or purple flowers
having dense spikes of small white flowers and yielding a bulb with medicinal properties
bulb of the sea squill, which is sliced, dried, and used as an expectorant