due vs collectible

due and collectible both are nouns.

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

due (noun)	collectible (noun)
that which is deserved or owed	things considered to be worth collecting (not necessarily valuable or antique)
a payment that is due (e.g., as the price of membership)

due (adjective)	collectible (adjective)
owed and payable immediately or on demand	subject to or requiring payment especially as specified
suitable to or expected in the circumstances
capable of being assigned or credited to
scheduled to arrive

due (adverb)	collectible (adverb)
directly or exactly; straight