sulfacetamide vs sulfa drug

sulfacetamide and sulfa drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
sulfacetamide	Yes	No	No	No
sulfa drug	Yes	No	No	No

As nouns, sulfa drug is a hypernym of sulfacetamide; that is, sulfa drug is a word with a broader meaning than sulfacetamide:

sulfacetamide: a topical sulfonamide (trade name Sulamyd) used to treat eye infections
sulfa drug: antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA

Other hypernyms of sulfacetamide include sulfa, sulfonamide, sulpha.

sulfacetamide (noun)	sulfa drug (noun)
a topical sulfonamide (trade name Sulamyd) used to treat eye infections	antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA