tea ceremony vs ceremony

tea ceremony and ceremony both are nouns.

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

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

tea ceremony: an ancient ritual for preparing and serving and drinking tea
ceremony: any activity that is performed in an especially solemn elaborate or formal way

tea ceremony (noun)	ceremony (noun)
an ancient ritual for preparing and serving and drinking tea	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