marriage vs bridal

marriage and bridal both are nouns.

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

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

Other hyponyms of marriage include espousal, civil marriage, love match, remarriage.

marriage (noun)	bridal (noun)
the act of marrying; the nuptial ceremony	archaic terms for a wedding or wedding feast
two people who are married to each other
the state of being a married couple voluntarily joined for life (or until divorce)
a close and intimate union

marriage (adjective)	bridal (adjective)
	of or pertaining to a bride
	of or relating to a wedding