blowfly vs bluebottle

blowfly and bluebottle both are nouns.

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

As nouns, bluebottle is a hyponym of blowfly; that is, bluebottle 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
bluebottle: blowfly with iridescent blue body; makes a loud buzzing noise in flight

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

blowfly (noun)	bluebottle (noun)
large usually hairy metallic blue or green fly; lays eggs in carrion or dung or wounds	blowfly with iridescent blue body; makes a loud buzzing noise in flight
	an annual Eurasian plant cultivated in North America having showy heads of blue or purple or pink or white flowers