winged pigweed vs shrub

winged pigweed and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
winged pigweed	Yes	No	No	No
shrub	Yes	No	No	No

As nouns, shrub is a hypernym of winged pigweed; that is, shrub is a word with a broader meaning than winged pigweed:

winged pigweed: bushy annual weed of central North America having greenish flowers and winged seeds
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of winged pigweed include bush.

winged pigweed (noun)	shrub (noun)
bushy annual weed of central North America having greenish flowers and winged seeds	a low woody perennial plant usually having several major stems