white lily vs Lilium candidum

white lily and Lilium candidum both are nouns.

Word	Noun	Adjective	Verb	Adverb
white lily	Yes	No	No	No
Lilium candidum	Yes	No	No	No

As nouns, white lily and Lilium candidum are synonyms defined as:

white lily and Lilium candidum: lily of eastern Mediterranean and the Balkans with broad funnel-shaped white flowers

Other synonyms of white lily include Annunciation lily, Lent lily, Madonna lily.

white lily (noun)	Lilium candidum (noun)
lily of eastern Mediterranean and the Balkans with broad funnel-shaped white flowers	lily of eastern Mediterranean and the Balkans with broad funnel-shaped white flowers
white Egyptian lotus: water lily of Egypt to southeastern Africa; held sacred by the Egyptians