Mass vs religious ritual

Mass and religious ritual both are nouns.

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

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

Mass: (Roman Catholic Church and Protestant Churches) the celebration of the Eucharist
religious ritual: a ceremony having religious meaning

Other hypernyms of Mass include religious ceremony.

Mass (noun)	religious ritual (noun)
(Roman Catholic Church and Protestant Churches) the celebration of the Eucharist	a ceremony having religious meaning
a musical setting for a Mass
a sequence of prayers constituting the Christian Eucharistic rite