Scotch thistle vs Onopordon acanthium

Scotch thistle and Onopordon acanthium both are nouns.

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

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

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

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

Scotch thistle (noun)	Onopordon acanthium (noun)
biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America	biennial Eurasian white hairy thistle having pale purple flowers; naturalized in North America