mercy kill vs euthanise

mercy kill and euthanise both are verbs.

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

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

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

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

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