poppy vs flower

poppy and flower both are nouns.

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

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

poppy (noun)	flower (noun)
annual or biennial or perennial herbs having showy flowers	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

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