mercy kill vs euthanatise

mercy kill and euthanatise both are verbs.

Word	Noun	Adjective	Verb	Adverb
mercy kill	No	No	Yes	No
euthanatise	No	No	Yes	No

As verbs, mercy kill and euthanatise are synonyms defined as:

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

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

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