sulfonamide vs sulfa

sulfonamide and sulfa both are nouns.

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

As nouns, sulfonamide and sulfa are synonyms defined as:

sulfonamide and sulfa: 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 drug, sulpha.

sulfonamide (noun)	sulfa (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