tulip vs Darwin tulip

tulip and Darwin tulip both are nouns.

Word	Noun	Adjective	Verb	Adverb
tulip	Yes	No	No	No
Darwin tulip	Yes	No	No	No

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

tulip: any of numerous perennial bulbous herbs having linear or broadly lanceolate leaves and usually a single showy flower
Darwin tulip: any of several very tall, late blooming tulips bearing large squarish flowers on sturdy stems

tulip (noun)	Darwin tulip (noun)
any of numerous perennial bulbous herbs having linear or broadly lanceolate leaves and usually a single showy flower	any of several very tall, late blooming tulips bearing large squarish flowers on sturdy stems