sulfa vs sulfa drug

sulfa and sulfa drug both are nouns.

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

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

sulfa 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 sulfa include sulfonamide, sulpha.

sulfa (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