antibiotic vs antibiotic drug

antibiotic and antibiotic drug both are nouns.

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

As nouns, antibiotic and antibiotic drug are synonyms defined as:

antibiotic and antibiotic drug: a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections

antibiotic (noun)	antibiotic drug (noun)
a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections	a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections

antibiotic (adjective)	antibiotic drug (adjective)
of or relating to antibiotic drugs