collectible vs peculiarity

collectible and peculiarity both are nouns.

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

As nouns, peculiarity is a hypernym of collectible; that is, peculiarity is a word with a broader meaning than collectible:

collectible: things considered to be worth collecting (not necessarily valuable or antique)
peculiarity: something unusual -- perhaps worthy of collecting

Other hypernyms of collectible include curio, curiosity, oddity, oddment, rarity.

collectible (noun)	peculiarity (noun)
things considered to be worth collecting (not necessarily valuable or antique)	something unusual -- perhaps worthy of collecting
	a distinguishing trait
	an odd or unusual characteristic

collectible (adjective)	peculiarity (adjective)
subject to or requiring payment especially as specified