sodium salicylate vs painkiller

sodium salicylate and painkiller both are nouns.

Word	Noun	Adjective	Verb	Adverb
sodium salicylate	Yes	No	No	No
painkiller	Yes	No	No	No

As nouns, painkiller is a hypernym of sodium salicylate; that is, painkiller is a word with a broader meaning than sodium salicylate:

Other hypernyms of sodium salicylate include analgesic, anodyne, pain pill.

sodium salicylate (noun)	painkiller (noun)
a crystalline salt used as an analgesic and antipyretic	a medicine used to relieve pain