Acanthus mollis vs bear's breech

Acanthus mollis and bear's breech both are nouns.

Word	Noun	Adjective	Verb	Adverb
Acanthus mollis	Yes	No	No	No
bear's breech	Yes	No	No	No

As nouns, Acanthus mollis and bear's breech are synonyms defined as:

Acanthus mollis and bear's breech: widely cultivated southern European acanthus with whitish purple-veined flowers

Other synonyms of Acanthus mollis include bear's breeches, sea holly.

Acanthus mollis (noun)	bear's breech (noun)
widely cultivated southern European acanthus with whitish purple-veined flowers	widely cultivated southern European acanthus with whitish purple-veined flowers