scilla vs spring squill

scilla and spring squill both are nouns.

Word	Noun	Adjective	Verb	Adverb
scilla	Yes	No	No	No
spring squill	Yes	No	No	No

As nouns, spring squill is a hyponym of scilla; that is, spring squill 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
spring squill: European scilla with small blue or purple flowers

Other hyponyms of scilla include Scilla verna, sea onion.

scilla (noun)	spring squill (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