peptide vs endorphin

peptide and endorphin both are nouns.

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

As nouns, endorphin is a hyponym of peptide; that is, endorphin is a word with a more specific, narrower meaning than peptide:

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

Other hyponyms of peptide include fibrinopeptide, polypeptide.

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