oyster plant vs vegetable oyster

oyster plant and vegetable oyster both are nouns.

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

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

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

oyster plant and vegetable oyster: 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 oyster plant include salsify, Tragopogon porrifolius.

oyster plant (noun)	vegetable oyster (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