energize vs energise

energize and energise both are verbs.

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

As verbs, energize and energise are synonyms defined as:

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

As verbs, energize and energise are synonyms defined as:

Other synonyms of energize include excite.

energize (verb)	energise (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