sea eryngium vs shrub

sea eryngium and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea eryngium	Yes	No	No	No
shrub	Yes	No	No	No

As nouns, shrub is a hypernym of sea eryngium; that is, shrub is a word with a broader meaning than sea eryngium:

sea eryngium: European evergreen eryngo with twisted spiny leaves naturalized on United States east coast; roots formerly used as an aphrodisiac
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of sea eryngium include bush.

sea eryngium (noun)	shrub (noun)
European evergreen eryngo with twisted spiny leaves naturalized on United States east coast; roots formerly used as an aphrodisiac	a low woody perennial plant usually having several major stems