synthesise vs synthesis

synthesise is not a noun while synthesis is a noun.

Word	Noun	Adjective	Verb	Adverb
synthesise	No	No	Yes	No
synthesis	Yes	No	No	No

synthesise (noun)	synthesis (noun)
	the combination of ideas into a complex whole
	reasoning from the general to the particular (or from cause to effect)
	the process of producing a chemical compound (usually by the union of simpler chemical compounds)

synthesise (verb)	synthesis (verb)
combine so as to form a more complex, product