palatalise vs palatalize

palatalise and palatalize both are verbs.

Word	Noun	Adjective	Verb	Adverb
palatalise	No	No	Yes	No
palatalize	No	No	Yes	No

As verbs, palatalise and palatalize are synonyms defined as:

palatalise and palatalize: pronounce a consonant with the tongue against the palate

palatalise (verb)	palatalize (verb)
pronounce a consonant with the tongue against the palate	pronounce a consonant with the tongue against the palate