scilla vs Scilla verna

scilla and Scilla verna both are nouns.

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

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

scilla: 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 scilla include sea onion, spring squill.

scilla (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