kiss of life vs heart massage

kiss of life and heart massage both are nouns.

Word	Noun	Adjective	Verb	Adverb
kiss of life	Yes	No	No	No
heart massage	Yes	No	No	No

kiss of life (noun)	heart massage (noun)
an emergency procedure consisting of external cardiac massage and artificial respiration; the first treatment for a person who has collapsed and has no pulse and has stopped breathing; attempts to restore circulation of the blood and prevent death or brain damage due to lack of oxygen	an emergency procedure that employs rhythmic compression of the heart (either through the chest wall or, during surgery, directly to the heart) in an attempt to maintain circulation during cardiac arrest