horn poppy vs flower

horn poppy and flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
horn poppy	Yes	No	No	No
flower	Yes	No	Yes	No

As nouns, flower is a hypernym of horn poppy; that is, flower is a word with a broader meaning than horn poppy:

horn poppy: yellow-flowered Eurasian glaucous herb naturalized in along sandy shores in eastern North America
flower: a plant cultivated for its blooms or blossoms

horn poppy (noun)	flower (noun)
yellow-flowered Eurasian glaucous herb naturalized in along sandy shores in eastern North America	a plant cultivated for its blooms or blossoms
	reproductive organ of angiosperm plants especially one having showy or colorful parts
	the period of greatest prosperity or productivity

horn poppy (verb)	flower (verb)
	produce or yield flowers