endorphin vs neurochemical

endorphin and neurochemical both are nouns.

Word	Noun	Adjective	Verb	Adverb
endorphin	Yes	No	No	No
neurochemical	Yes	No	No	No

As nouns, neurochemical is a hypernym of endorphin; that is, neurochemical is a word with a broader meaning than endorphin:

endorphin: a neurochemical occurring naturally in the brain and having analgesic properties
neurochemical: any organic substance that occurs in neural activity

Other hypernyms of endorphin include peptide.

endorphin (noun)	neurochemical (noun)
a neurochemical occurring naturally in the brain and having analgesic properties	any organic substance that occurs in neural activity