arum lily vs flower

arum lily and flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
arum lily	Yes	No	No	No
flower	Yes	No	Yes	No

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

arum lily: South African plant widely cultivated for its showy pure white spathe and yellow spadix
flower: a plant cultivated for its blooms or blossoms

arum lily (noun)	flower (noun)
South African plant widely cultivated for its showy pure white spathe and yellow spadix	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

arum lily (verb)	flower (verb)
	produce or yield flowers