libation vs religious ritual

libation and religious ritual both are nouns.

Word	Noun	Adjective	Verb	Adverb
libation	Yes	No	No	No
religious ritual	Yes	No	No	No

As nouns, religious ritual is a hypernym of libation; that is, religious ritual is a word with a broader meaning than libation:

libation: the act of pouring a liquid offering (especially wine) as a religious ceremony
religious ritual: a ceremony having religious meaning

Other hypernyms of libation include religious ceremony.

libation (noun)	religious ritual (noun)
the act of pouring a liquid offering (especially wine) as a religious ceremony	a ceremony having religious meaning
a serving (of wine) poured out in honor of a deity
(facetious) a serving of an alcoholic beverage