French spinach vs Chenopodium rubrum

French spinach and Chenopodium rubrum both are nouns.

Word	Noun	Adjective	Verb	Adverb
French spinach	Yes	No	No	No
Chenopodium rubrum	Yes	No	No	No

As nouns, French spinach and Chenopodium rubrum are synonyms defined as:

French spinach and Chenopodium rubrum: common Eurasian weed; naturalized in United States

Other synonyms of French spinach include red goosefoot.

French spinach (noun)	Chenopodium rubrum (noun)
common Eurasian weed; naturalized in United States	common Eurasian weed; naturalized in United States