colchicine vs pain pill

colchicine and pain pill both are nouns.

Word	Noun	Adjective	Verb	Adverb
colchicine	Yes	No	No	No
pain pill	Yes	No	No	No

As nouns, pain pill is a hypernym of colchicine; that is, pain pill is a word with a broader meaning than colchicine:

colchicine: an analgesic drug derived from the saffron plant and used to treat gout
pain pill: a medicine used to relieve pain

Other hypernyms of colchicine include analgesic, anodyne, painkiller.

colchicine (noun)	pain pill (noun)
an analgesic drug derived from the saffron plant and used to treat gout	a medicine used to relieve pain