sulfamethoxazole vs sulfa

sulfamethoxazole and sulfa both are nouns.

Word	Noun	Adjective	Verb	Adverb
sulfamethoxazole	Yes	No	No	No
sulfa	Yes	No	No	No

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

sulfamethoxazole: a sulfonamide (trade name Gantanol) used to treat infections (especially infections of the urinary tract)
sulfa: antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA

Other hypernyms of sulfamethoxazole include sulfa drug, sulfonamide, sulpha.

sulfamethoxazole (noun)	sulfa (noun)
a sulfonamide (trade name Gantanol) used to treat infections (especially infections of the urinary tract)	antibacterial consisting of any of several synthetic organic compounds capable of inhibiting the growth of bacteria that require PABA