euthanize vs mercy kill

euthanize and mercy kill both are verbs.

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

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

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

Other synonyms of euthanize include euthanatise, euthanatize, euthanise.

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