common marigold vs Calendula officinalis

common marigold and Calendula officinalis both are nouns.

Word	Noun	Adjective	Verb	Adverb
common marigold	Yes	No	No	No
Calendula officinalis	Yes	No	No	No

As nouns, common marigold and Calendula officinalis are synonyms defined as:

common marigold and Calendula officinalis: the common European annual marigold

Other synonyms of common marigold include pot marigold, ruddles, Scotch marigold.

common marigold (noun)	Calendula officinalis (noun)
the common European annual marigold	the common European annual marigold