polypeptide vs peptide

polypeptide and peptide both are nouns.

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

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

polypeptide: a peptide containing 10 to more than 100 amino acids
peptide: amide combining the amino group of one amino acid with the carboxyl group of another; usually obtained by partial hydrolysis of protein

polypeptide (noun)	peptide (noun)
a peptide containing 10 to more than 100 amino acids	amide combining the amino group of one amino acid with the carboxyl group of another; usually obtained by partial hydrolysis of protein