wild spinach vs lamb's-quarter

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

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

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

Other synonyms of wild spinach include pigweed.

wild spinach (noun)	lamb's-quarter (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