lily vs white lily

lily and white lily both are nouns.

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

As nouns, white lily is a hyponym of lily; that is, white lily is a word with a more specific, narrower meaning than lily:

lily: any liliaceous plant of the genus Lilium having showy pendulous flowers
white lily: lily of eastern Mediterranean and the Balkans with broad funnel-shaped white flowers

lily (noun)	white lily (noun)
any liliaceous plant of the genus Lilium having showy pendulous 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