peculiarity vs distinctive feature

peculiarity and distinctive feature both are nouns.

Word	Noun	Adjective	Verb	Adverb
peculiarity	Yes	No	No	No
distinctive feature	Yes	No	No	No

As nouns, peculiarity and distinctive feature are synonyms defined as:

Other synonyms of peculiarity include distinguishing characteristic.

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