common marigold vs ruddles

common marigold and ruddles both are nouns.

Word	Noun	Adjective	Verb	Adverb
common marigold	Yes	No	No	No
ruddles	Yes	No	No	No

As nouns, common marigold and ruddles are synonyms defined as:

Other synonyms of common marigold include Calendula officinalis, pot marigold, Scotch marigold.

common marigold (noun)	ruddles (noun)
the common European annual marigold	the common European annual marigold