lily vs tiger lily

lily and tiger lily both are nouns.

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

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

lily: any liliaceous plant of the genus Lilium having showy pendulous flowers
tiger lily: lily of southeastern United States having cup-shaped flowers with deep yellow to scarlet recurved petals

lily (noun)	tiger lily (noun)
any liliaceous plant of the genus Lilium having showy pendulous flowers	lily of southeastern United States having cup-shaped flowers with deep yellow to scarlet recurved petals
	east Asian perennial having large reddish-orange black-spotted flowers with reflexed petals