collectible vs oddment

collectible and oddment both are nouns.

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

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

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

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

collectible (noun)	oddment (noun)
things considered to be worth collecting (not necessarily valuable or antique)	a piece of cloth that is left over after the rest has been used or sold
	something unusual -- perhaps worthy of collecting

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