sea holm vs Eryngium maritimum

sea holm and Eryngium maritimum both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea holm	Yes	No	No	No
Eryngium maritimum	Yes	No	No	No

As nouns, sea holm and Eryngium maritimum are synonyms defined as:

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

Other synonyms of sea holm include sea eryngium, sea holly.

sea holm (noun)	Eryngium maritimum (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