sea holly vs bear's breech

sea holly and bear's breech both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea holly	Yes	No	No	No
bear's breech	Yes	No	No	No

As nouns, sea holly and bear's breech are synonyms defined as:

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

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

sea holly (noun)	bear's breech (noun)
European evergreen eryngo with twisted spiny leaves naturalized on United States east coast; roots formerly used as an aphrodisiac	widely cultivated southern European acanthus with whitish purple-veined flowers
widely cultivated southern European acanthus with whitish purple-veined flowers