sea holly vs sea holm

sea holly and sea holm both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea holly	Yes	No	No	No
sea holm	Yes	No	No	No

As nouns, sea holly and sea holm are synonyms defined as:

sea holly and sea holm: European evergreen eryngo with twisted spiny leaves naturalized on United States east coast; roots formerly used as an aphrodisiac

Other synonyms of sea holly include Eryngium maritimum, sea eryngium.

sea holly (noun)	sea holm (noun)
European evergreen eryngo with twisted spiny leaves naturalized on United States east coast; roots formerly used as an aphrodisiac	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