sulfonamide vs sulfa drug

sulfonamide and sulfa drug both are nouns.

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

As nouns, sulfonamide and sulfa drug are synonyms defined as:

sulfonamide and sulfa drug: antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA

Other synonyms of sulfonamide include sulfa, sulpha.

sulfonamide (noun)	sulfa drug (noun)
antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA	antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA