peculiarity vs curio

peculiarity and curio both are nouns.

Word	Noun	Adjective	Verb	Adverb
peculiarity	Yes	No	No	No
curio	Yes	No	No	No

As nouns, peculiarity and curio are synonyms defined as:

peculiarity and curio: something unusual -- perhaps worthy of collecting

Other synonyms of peculiarity include curiosity, oddity, oddment, rarity.

peculiarity (noun)	curio (noun)
something unusual -- perhaps worthy of collecting	something unusual -- perhaps worthy of collecting
a distinguishing trait
an odd or unusual characteristic