tumbleweed vs Amaranthus graecizans

tumbleweed and Amaranthus graecizans both are nouns.

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

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

tumbleweed and Amaranthus graecizans: bushy plant of western United States

Other synonyms of tumbleweed include Amaranthus albus.

tumbleweed (noun)	Amaranthus graecizans (noun)
any plant that breaks away from its roots in autumn and is driven by the wind as a light rolling mass	bushy plant of western United States
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