Spinacia oleracea vs spinach

Spinacia oleracea and spinach both are nouns.

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

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

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

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

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