extreme unction vs anointing of the sick

extreme unction and anointing of the sick both are nouns.

Word	Noun	Adjective	Verb	Adverb
extreme unction	Yes	No	No	No
anointing of the sick	Yes	No	No	No

As nouns, extreme unction and anointing of the sick are synonyms defined as:

extreme unction and anointing of the sick: a Catholic sacrament; a priest anoints a dying person with oil and prays for salvation

Other synonyms of extreme unction include last rites.

extreme unction (noun)	anointing of the sick (noun)
a Catholic sacrament; a priest anoints a dying person with oil and prays for salvation	a Catholic sacrament; a priest anoints a dying person with oil and prays for salvation