wedding vs remarriage

wedding and remarriage both are nouns.

Word	Noun	Adjective	Verb	Adverb
wedding	Yes	No	No	No
remarriage	Yes	No	No	No

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

Other hyponyms of wedding include bridal, espousal, civil marriage, love match.

wedding (noun)	remarriage (noun)
the act of marrying; the nuptial ceremony	the act of marrying again
the social event at which the ceremony of marriage is performed
a party of people at a wedding