marriage vs ritual

marriage and ritual both are nouns.

Word	Noun	Adjective	Verb	Adverb
marriage	Yes	No	No	No
ritual	Yes	Yes	No	No

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

Other hypernyms of marriage include rite.

marriage (noun)	ritual (noun)
the act of marrying; the nuptial ceremony	any customary observance or practice
two people who are married to each other	the prescribed procedure for conducting religious ceremonies
the state of being a married couple voluntarily joined for life (or until divorce)	stereotyped behavior
a close and intimate union

marriage (adjective)	ritual (adjective)
	of or relating to or employed in social rites or rituals
	of or relating to or characteristic of religious rituals