euthanise vs mercy kill

euthanise and mercy kill both are verbs.

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

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

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

Other synonyms of euthanise include euthanatise, euthanatize, euthanize.

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