yellow trumpet vs trumpets

yellow trumpet and trumpets both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow trumpet	Yes	No	No	No
trumpets	Yes	No	No	No

As nouns, yellow trumpet and trumpets are synonyms defined as:

yellow trumpet and trumpets: pitcher plant of southeastern United States having erect yellow trumpet-shaped pitchers with wide mouths and erect lids

Other synonyms of yellow trumpet include huntsman's horn, huntsman's horns, Sarracenia flava, yellow pitcher plant.

yellow trumpet (noun)	trumpets (noun)
pitcher plant of southeastern United States having erect yellow trumpet-shaped pitchers with wide mouths and erect lids	pitcher plant of southeastern United States having erect yellow trumpet-shaped pitchers with wide mouths and erect lids