euthanatize vs mercy kill

euthanatize and mercy kill both are verbs.

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

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

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

Other synonyms of euthanatize include euthanatise, euthanise, euthanize.

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