vegetable oyster vs oyster plant

vegetable oyster and oyster plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
vegetable oyster	Yes	No	No	No
oyster plant	Yes	No	No	No

As nouns, vegetable oyster and oyster plant are synonyms defined as:

As nouns, vegetable oyster and oyster plant are synonyms defined as:

vegetable oyster and oyster plant: Mediterranean biennial herb with long-stemmed heads of purple ray flowers and milky sap and long edible root; naturalized throughout United States

Other synonyms of vegetable oyster include salsify, Tragopogon porrifolius.

vegetable oyster (noun)	oyster plant (noun)
long white salsify	long white salsify
Mediterranean biennial herb with long-stemmed heads of purple ray flowers and milky sap and long edible root; naturalized throughout United States	Mediterranean biennial herb with long-stemmed heads of purple ray flowers and milky sap and long edible root; naturalized throughout United States
	edible root of the salsify plant