amortise vs amortisation

amortise is not a noun while amortisation is a noun.

Word	Noun	Adjective	Verb	Adverb
amortise	No	No	Yes	No
amortisation	Yes	No	No	No

amortise (noun)	amortisation (noun)
	payment of an obligation in a series of installments or transfers
	the reduction of the value of an asset by prorating its cost over a period of years

amortise (verb)	amortisation (verb)
liquidate gradually