drosophila vs fruit fly

Any fruit fly of the genus Drosophila 

any insect of the Drosophilidae family, whose larvae feed on ripening fruit, especially the species Drosophila melanogaster that is used in genetic research. 

A woman who enjoys the company of homosexual men; a "fag hag". 

any insect of the Tephritidae family, whose larvae damage plant tissue.