last rites vs religious rite

last rites and religious rite both are nouns.

Word	Noun	Adjective	Verb	Adverb
last rites	Yes	No	No	No
religious rite	Yes	No	No	No

As nouns, religious rite is a hypernym of last rites; that is, religious rite is a word with a broader meaning than last rites:

Other hypernyms of last rites include rite.

last rites (noun)	religious rite (noun)
rites performed in connection with a death or burial	an established ceremony prescribed by a religion
a Catholic sacrament; a priest anoints a dying person with oil and prays for salvation