sulfa drug vs sulfonamide

sulfa drug and sulfonamide both are nouns.

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

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

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

Other synonyms of sulfa drug include sulfa, sulpha.

sulfa drug (noun)	sulfonamide (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