Zantedeschia rehmanii vs calla

Zantedeschia rehmanii and calla both are nouns.

Word	Noun	Adjective	Verb	Adverb
Zantedeschia rehmanii	Yes	No	No	No
calla	Yes	No	No	No

As nouns, calla is a hypernym of Zantedeschia rehmanii; that is, calla is a word with a broader meaning than Zantedeschia rehmanii:

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

Other hypernyms of Zantedeschia rehmanii include arum lily, calla lily, Zantedeschia aethiopica.

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