sulpha vs sulfa drug

sulpha and sulfa drug both are nouns.

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

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

sulpha 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 sulpha include sulfa, sulfonamide.

sulpha (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