spinach vs spinach plant

spinach and spinach plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
spinach	Yes	No	No	No
spinach plant	Yes	No	No	No

As nouns, spinach and spinach plant are synonyms defined as:

spinach and spinach plant: southwestern Asian plant widely cultivated for its succulent edible dark green leaves

Other synonyms of spinach include prickly-seeded spinach, Spinacia oleracea.

spinach (noun)	spinach plant (noun)
dark green leaves; eaten cooked or raw in salads	southwestern Asian plant widely cultivated for its succulent edible dark green leaves
southwestern Asian plant widely cultivated for its succulent edible dark green leaves