anointing of the sick vs extreme unction

anointing of the sick and extreme unction both are nouns.

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

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

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

Other synonyms of anointing of the sick include last rites.

anointing of the sick (noun)	extreme unction (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