blowfly vs greenbottle

blowfly and greenbottle both are nouns.

Word	Noun	Adjective	Verb	Adverb
blowfly	Yes	No	No	No
greenbottle	Yes	No	No	No

As nouns, greenbottle is a hyponym of blowfly; that is, greenbottle is a word with a more specific, narrower meaning than blowfly:

blowfly: large usually hairy metallic blue or green fly; lays eggs in carrion or dung or wounds
greenbottle: blowfly with brilliant coppery green body

Other hyponyms of blowfly include bluebottle, Calliphora vicina, greenbottle fly.

blowfly (noun)	greenbottle (noun)
large usually hairy metallic blue or green fly; lays eggs in carrion or dung or wounds	blowfly with brilliant coppery green body