spinach plant vs Spinacia oleracea

spinach plant and Spinacia oleracea both are nouns.

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

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

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

Other synonyms of spinach plant include prickly-seeded spinach, spinach.

spinach plant (noun)	Spinacia oleracea (noun)
southwestern Asian plant widely cultivated for its succulent edible dark green leaves	southwestern Asian plant widely cultivated for its succulent edible dark green leaves