nalidixic acid vs bactericide

nalidixic acid and bactericide both are nouns.

Word	Noun	Adjective	Verb	Adverb
nalidixic acid	Yes	No	No	No
bactericide	Yes	No	No	No

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

nalidixic acid: antibacterial agent used especially to treat genitourinary infections
bactericide: any drug that destroys bacteria or inhibits their growth

Other hypernyms of nalidixic acid include antibacterial, antibacterial drug.

nalidixic acid (noun)	bactericide (noun)
antibacterial agent used especially to treat genitourinary infections	any drug that destroys bacteria or inhibits their growth
	any chemical agent that destroys bacteria