Russian thistle vs Russian tumbleweed

Russian thistle and Russian tumbleweed both are nouns.

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

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

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

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

Russian thistle (noun)	Russian tumbleweed (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