salsify vs oyster plant

salsify and oyster plant both are nouns.

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

As nouns, oyster plant is a hyponym of salsify; that is, oyster plant is a word with a more specific, narrower meaning than salsify:

Other hyponyms of salsify include vegetable oyster, black salsify, scorzonera.

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

salsify 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 salsify include Tragopogon porrifolius, vegetable oyster.

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

salsify (noun)	oyster plant (noun)
either of two long roots eaten cooked	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	edible root of the salsify plant