Onopordon acanthium vs woolly thistle

Onopordon acanthium and woolly thistle both are nouns.

Word	Noun	Adjective	Verb	Adverb
Onopordon acanthium	Yes	No	No	No
woolly thistle	Yes	No	No	No

As nouns, Onopordon acanthium and woolly thistle are synonyms defined as:

Onopordon acanthium and woolly thistle: biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America

Other synonyms of Onopordon acanthium include cotton thistle, Onopordum acanthium, Scotch thistle.

Onopordon acanthium (noun)	woolly thistle (noun)
biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America	thistle of western North America having white woolly leaves
	biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America