arum lily vs pink calla

arum lily and pink calla both are nouns.

Word	Noun	Adjective	Verb	Adverb
arum lily	Yes	No	No	No
pink calla	Yes	No	No	No

As nouns, pink calla is a hyponym of arum lily; that is, pink calla is a word with a more specific, narrower meaning than arum lily:

arum lily: South African plant widely cultivated for its showy pure white spathe and yellow spadix
pink calla: calla having a rose-colored spathe

Other hyponyms of arum lily include Zantedeschia rehmanii, golden calla.

arum lily (noun)	pink calla (noun)
South African plant widely cultivated for its showy pure white spathe and yellow spadix	calla having a rose-colored spathe