nuptials vs ceremony

nuptials and ceremony both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuptials	Yes	No	No	No
ceremony	Yes	No	No	No

As nouns, ceremony is a hypernym of nuptials; that is, ceremony is a word with a broader meaning than nuptials:

Other hypernyms of nuptials include ceremonial, ceremonial occasion, observance.

nuptials (noun)	ceremony (noun)
the social event at which the ceremony of marriage is performed	the proper or conventional behavior on some solemn occasion
	any activity that is performed in an especially solemn elaborate or formal way
	a formal event performed on a special occasion