blackfly vs bean aphid

blackfly and bean aphid both are nouns.

Word	Noun	Adjective	Verb	Adverb
blackfly	Yes	No	No	No
bean aphid	Yes	No	No	No

As nouns, blackfly and bean aphid are synonyms defined as:

blackfly and bean aphid: blackish aphid that infests e.g. beans and sugar beets

Other synonyms of blackfly include Aphis fabae.

blackfly (noun)	bean aphid (noun)
small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals	blackish aphid that infests e.g. beans and sugar beets
blackish aphid that infests e.g. beans and sugar beets