palatalize vs palatalise

palatalize and palatalise both are verbs.

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

As verbs, palatalize and palatalise are synonyms defined as:

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

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