lamb's-quarter vs wild spinach

lamb's-quarter and wild spinach both are nouns.

Word	Noun	Adjective	Verb	Adverb
lamb's-quarter	Yes	No	No	No
wild spinach	Yes	No	No	No

As nouns, lamb's-quarter and wild spinach are synonyms defined as:

Other synonyms of lamb's-quarter include pigweed.

lamb's-quarter (noun)	wild spinach (noun)
leaves collected from the wild	leaves collected from the wild
	leafy greens collected from the wild and used as a substitute for spinach
	common weedy European plant introduced into North America; often used as a potherb
	European plant naturalized in North America; often collected from the wild as a potherb