tumbleweed vs Amaranthus albus

tumbleweed and Amaranthus albus both are nouns.

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

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

Other synonyms of tumbleweed include Amaranthus graecizans.

tumbleweed (noun)	Amaranthus albus (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