housefly vs Musca domestica

housefly and Musca domestica both are nouns.

Word	Noun	Adjective	Verb	Adverb
housefly	Yes	No	No	No
Musca domestica	Yes	No	No	No

As nouns, housefly and Musca domestica are synonyms defined as:

housefly and Musca domestica: common fly that frequents human habitations and spreads many diseases

Other synonyms of housefly include house fly.

housefly (noun)	Musca domestica (noun)
common fly that frequents human habitations and spreads many diseases	common fly that frequents human habitations and spreads many diseases