peplos vs peplus

peplos and peplus both are nouns.

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

As nouns, peplos and peplus are synonyms defined as:

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

Other synonyms of peplos include peplum.

peplos (noun)	peplus (noun)
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