endorphin vs peptide

endorphin and peptide both are nouns.

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

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

endorphin: a neurochemical occurring naturally in the brain and having analgesic properties
peptide: amide combining the amino group of one amino acid with the carboxyl group of another; usually obtained by partial hydrolysis of protein

Other hypernyms of endorphin include neurochemical.

endorphin (noun)	peptide (noun)
a neurochemical occurring naturally in the brain and having analgesic properties	amide combining the amino group of one amino acid with the carboxyl group of another; usually obtained by partial hydrolysis of protein