acetphenetidin vs painkiller

acetphenetidin and painkiller both are nouns.

Word	Noun	Adjective	Verb	Adverb
acetphenetidin	Yes	No	No	No
painkiller	Yes	No	No	No

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

acetphenetidin: a white crystalline compound used as an analgesic and also as an antipyretic
painkiller: a medicine used to relieve pain

Other hypernyms of acetphenetidin include analgesic, anodyne, pain pill.

acetphenetidin (noun)	painkiller (noun)
a white crystalline compound used as an analgesic and also as an antipyretic	a medicine used to relieve pain