phenylacetamide vs pain pill

phenylacetamide and pain pill both are nouns.

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

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

phenylacetamide: a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen)
pain pill: a medicine used to relieve pain

Other hypernyms of phenylacetamide include analgesic, anodyne, painkiller.

phenylacetamide (noun)	pain pill (noun)
a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen)	a medicine used to relieve pain