collectable vs payable

collectable and payable both are nouns.

Word	Noun	Adjective	Verb	Adverb
collectable	Yes	Yes	No	No
payable	Yes	Yes	No	No

As adjectives, collectable and payable are synonyms defined as:

collectable and payable: subject to or requiring payment especially as specified

Other synonyms of collectable include collectible.

collectable (noun)	payable (noun)
things considered to be worth collecting (not necessarily valuable or antique)	a liability account showing how much is owed for goods and services purchased on credit

collectable (adjective)	payable (adjective)
subject to or requiring payment especially as specified	subject to or requiring payment especially as specified