last rites vs extreme unction

last rites and extreme unction both are nouns.

Word	Noun	Adjective	Verb	Adverb
last rites	Yes	No	No	No
extreme unction	Yes	No	No	No

As nouns, last rites and extreme unction are synonyms defined as:

last rites and extreme unction: a Catholic sacrament; a priest anoints a dying person with oil and prays for salvation

Other synonyms of last rites include anointing of the sick.

last rites (noun)	extreme unction (noun)
rites performed in connection with a death or burial	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