ritual vs betrothal

ritual and betrothal both are nouns.

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

As nouns, betrothal is a hyponym of ritual; that is, betrothal is a word with a more specific, narrower meaning than ritual:

Other hyponyms of ritual include espousal, marriage, marriage ceremony, wedding, rite of passage.

ritual (noun)	betrothal (noun)
any customary observance or practice	the act of becoming betrothed or engaged
the prescribed procedure for conducting religious ceremonies	a mutual promise to marry
stereotyped behavior

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