euthanize vs euthanatise

euthanize and euthanatise both are verbs.

Word	Noun	Adjective	Verb	Adverb
euthanize	No	No	Yes	No
euthanatise	No	No	Yes	No

As verbs, euthanize and euthanatise are synonyms defined as:

euthanize and euthanatise: intentionally cause the painless death of a person or animal

Other synonyms of euthanize include euthanatize, euthanise, mercy kill.

euthanize (verb)	euthanatise (verb)
intentionally cause the painless death of a person or animal	intentionally cause the painless death of a person or animal