Calendula officinalis vs ruddles

Calendula officinalis and ruddles both are nouns.

Word	Noun	Adjective	Verb	Adverb
Calendula officinalis	Yes	No	No	No
ruddles	Yes	No	No	No

As nouns, Calendula officinalis and ruddles are synonyms defined as:

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

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