blue fleabane vs Erigeron acer

blue fleabane and Erigeron acer both are nouns.

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

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

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

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