sulfanilamide vs sulfa drug

sulfanilamide and sulfa drug both are nouns.

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

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

sulfanilamide: a white odorless crystalline sulfa drug; the parent compound of most of the sulfa drugs
sulfa drug: antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA

Other hypernyms of sulfanilamide include sulfa, sulfonamide, sulpha.

sulfanilamide (noun)	sulfa drug (noun)
a white odorless crystalline sulfa drug; the parent compound of most of the sulfa drugs	antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA