peplum vs peplos

peplum and peplos both are nouns.

Word	Noun	Adjective	Verb	Adverb
peplum	Yes	No	No	No
peplos	Yes	No	No	No

As nouns, peplum and peplos are synonyms defined as:

peplum and peplos: a garment worn by women in ancient Greece; cloth caught at the shoulders and draped in folds to the waist

Other synonyms of peplum include peplus.

peplum (noun)	peplos (noun)
a flared ruffle attached to the waistline of a dress or jacket or blouse	a garment worn by women in ancient Greece; cloth caught at the shoulders and draped in folds to the waist
a garment worn by women in ancient Greece; cloth caught at the shoulders and draped in folds to the waist