libation vs religious ceremony

libation and religious ceremony both are nouns.

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

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

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

Other hypernyms of libation include religious ritual.

libation (noun)	religious ceremony (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