calendula vs ruddles

calendula and ruddles both are nouns.

Word	Noun	Adjective	Verb	Adverb
calendula	Yes	No	No	No
ruddles	Yes	No	No	No

As nouns, ruddles is a hyponym of calendula; that is, ruddles is a word with a more specific, narrower meaning than calendula:

calendula: any of numerous chiefly annual herbs of the genus Calendula widely cultivated for their yellow or orange flowers; often used for medicinal and culinary purposes
ruddles: the common European annual marigold

Other hyponyms of calendula include Calendula officinalis, common marigold, pot marigold, Scotch marigold.

calendula (noun)	ruddles (noun)
any of numerous chiefly annual herbs of the genus Calendula widely cultivated for their yellow or orange flowers; often used for medicinal and culinary purposes	the common European annual marigold