blowfly vs blow fly

blowfly and blow fly both are nouns.

Word	Noun	Adjective	Verb	Adverb
blowfly	Yes	No	No	No
blow fly	Yes	No	No	No

As nouns, blowfly and blow fly are synonyms defined as:

blowfly and blow fly: large usually hairy metallic blue or green fly; lays eggs in carrion or dung or wounds

blowfly (noun)	blow fly (noun)
large usually hairy metallic blue or green fly; lays eggs in carrion or dung or wounds	large usually hairy metallic blue or green fly; lays eggs in carrion or dung or wounds