tobramycin vs antibiotic drug

tobramycin and antibiotic drug both are nouns.

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

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

tobramycin: an antibiotic (trade name Nebcin) that is especially effective against Gram-negative bacteria
antibiotic drug: a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections

Other hypernyms of tobramycin include antibiotic.

tobramycin (noun)	antibiotic drug (noun)
an antibiotic (trade name Nebcin) that is especially effective against Gram-negative bacteria	a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections