energise vs energize

energise and energize both are verbs.

Word	Noun	Adjective	Verb	Adverb
energise	No	No	Yes	No
energize	No	No	Yes	No

As verbs, energise and energize are synonyms defined as:

Other synonyms of energise include arouse, brace, perk up, stimulate.

As verbs, energise and energize are synonyms defined as:

Other synonyms of energise include excite.

energise (verb)	energize (verb)
cause to be alert and energetic	cause to be alert and energetic
raise to a higher energy level	raise to a higher energy level