wedding ceremony vs ceremony

wedding ceremony and ceremony both are nouns.

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

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

wedding ceremony: the social event at which the ceremony of marriage is performed
ceremony: a formal event performed on a special occasion

Other hypernyms of wedding ceremony include ceremonial, ceremonial occasion, observance.

wedding ceremony (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