Chenopodium album vs pigweed

Chenopodium album and pigweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chenopodium album	Yes	No	No	No
pigweed	Yes	No	No	No

As nouns, Chenopodium album and pigweed are synonyms defined as:

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

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

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