yellow trumpet vs pitcher plant

yellow trumpet and pitcher plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow trumpet	Yes	No	No	No
pitcher plant	Yes	No	No	No

As nouns, pitcher plant is a hypernym of yellow trumpet; that is, pitcher plant is a word with a broader meaning than yellow trumpet:

yellow trumpet: pitcher plant of southeastern United States having erect yellow trumpet-shaped pitchers with wide mouths and erect lids
pitcher plant: any of several insectivorous herbs of the order Sarraceniales

yellow trumpet (noun)	pitcher plant (noun)
pitcher plant of southeastern United States having erect yellow trumpet-shaped pitchers with wide mouths and erect lids	any of several insectivorous herbs of the order Sarraceniales