ionise vs ionisation

ionise is not a noun while ionisation is a noun.

Word	Noun	Adjective	Verb	Adverb
ionise	No	No	Yes	No
ionisation	Yes	No	No	No

ionise (noun)	ionisation (noun)
	the process of ionizing; the formation of ions by separating atoms or molecules or radicals or by adding or subtracting electrons from atoms by strong electric fields in a gas
	the condition of being dissociated into ions (as by heat or radiation or chemical reaction or electrical discharge)

ionise (verb)	ionisation (verb)
convert into ions
become converted into ions