Erigeron acer vs blue fleabane

Erigeron acer and blue fleabane both are nouns.

Word	Noun	Adjective	Verb	Adverb
Erigeron acer	Yes	No	No	No
blue fleabane	Yes	No	No	No

As nouns, Erigeron acer and blue fleabane are synonyms defined as:

Erigeron acer and blue fleabane: widespread weed with pale purple-blue flowers

Erigeron acer (noun)	blue fleabane (noun)
widespread weed with pale purple-blue flowers	widespread weed with pale purple-blue flowers