antibiotic drug vs bactericide

antibiotic drug and bactericide both are nouns.

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

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

antibiotic drug: a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections
bactericide: any drug that destroys bacteria or inhibits their growth

Other hypernyms of antibiotic drug include antibacterial, antibacterial drug.

antibiotic drug (noun)	bactericide (noun)
a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections	any drug that destroys bacteria or inhibits their growth
	any chemical agent that destroys bacteria