Russian tumbleweed vs Russian thistle

Russian tumbleweed and Russian thistle both are nouns.

Word	Noun	Adjective	Verb	Adverb
Russian tumbleweed	Yes	No	No	No
Russian thistle	Yes	No	No	No

As nouns, Russian tumbleweed and Russian thistle are synonyms defined as:

Russian tumbleweed and Russian thistle: prickly bushy Eurasian plant; a troublesome weed in central and western United States

Other synonyms of Russian tumbleweed include Russian cactus, Salsola kali tenuifolia, tumbleweed.

Russian tumbleweed (noun)	Russian thistle (noun)
prickly bushy Eurasian plant; a troublesome weed in central and western United States	prickly bushy Eurasian plant; a troublesome weed in central and western United States