Amaranthus albus vs tumbleweed

Amaranthus albus and tumbleweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
Amaranthus albus	Yes	No	No	No
tumbleweed	Yes	No	No	No

As nouns, Amaranthus albus and tumbleweed are synonyms defined as:

Other synonyms of Amaranthus albus include Amaranthus graecizans.

Amaranthus albus (noun)	tumbleweed (noun)
bushy plant of western United States	any plant that breaks away from its roots in autumn and is driven by the wind as a light rolling mass
	bushy annual weed of central North America having greenish flowers and winged seeds
	bushy plant of western United States
	prickly bushy Eurasian plant; a troublesome weed in central and western United States