sulfa drug vs bactericide

sulfa drug and bactericide both are nouns.

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

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

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

Other hypernyms of sulfa drug include antibacterial, antibacterial drug.

sulfa drug (noun)	bactericide (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
	any chemical agent that destroys bacteria