wild rice vs Zizania aquatica

wild rice and Zizania aquatica both are nouns.

Word	Noun	Adjective	Verb	Adverb
wild rice	Yes	No	No	No
Zizania aquatica	Yes	No	No	No

As nouns, wild rice and Zizania aquatica are synonyms defined as:

wild rice and Zizania aquatica: perennial aquatic grass of North America bearing grain used for food

wild rice (noun)	Zizania aquatica (noun)
grains of aquatic grass of North America	perennial aquatic grass of North America bearing grain used for food
perennial aquatic grass of North America bearing grain used for food