pigweed vs wild spinach

pigweed and wild spinach both are nouns.

Word	Noun	Adjective	Verb	Adverb
pigweed	Yes	No	No	No
wild spinach	Yes	No	No	No

As nouns, pigweed and wild spinach are synonyms defined as:

Other synonyms of pigweed include lamb's-quarter.

As nouns, pigweed and wild spinach are synonyms defined as:

pigweed and wild spinach: common weedy European plant introduced into North America; often used as a potherb

Other synonyms of pigweed include Chenopodium album, lamb's-quarters.

pigweed (noun)	wild spinach (noun)
leaves collected from the wild	leaves collected from the wild
common weedy European plant introduced into North America; often used as a potherb	leafy greens collected from the wild and used as a substitute for spinach
leaves sometimes used as potherbs; seeds used as cereal; southern United States to Central America; India and China	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