sulfa vs antibacterial drug

sulfa and antibacterial drug both are nouns.

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

As nouns, antibacterial drug is a hypernym of sulfa; that is, antibacterial drug is a word with a broader meaning than sulfa:

sulfa: antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA
antibacterial drug: any drug that destroys bacteria or inhibits their growth

Other hypernyms of sulfa include antibacterial, bactericide.

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