cape marigold vs sun marigold

cape marigold and sun marigold both are nouns.

Word	Noun	Adjective	Verb	Adverb
cape marigold	Yes	No	No	No
sun marigold	Yes	No	No	No

As nouns, cape marigold and sun marigold are synonyms defined as:

cape marigold and sun marigold: any of several South African plants grown for the profusion of usually yellow daisylike flowers and mounds of aromatic foliage

Other synonyms of cape marigold include star of the veldt.

cape marigold (noun)	sun marigold (noun)
any of several South African plants grown for the profusion of usually yellow daisylike flowers and mounds of aromatic foliage	any of several South African plants grown for the profusion of usually yellow daisylike flowers and mounds of aromatic foliage