ceremony vs activity

ceremony and activity both are nouns.

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

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

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

ceremony: any activity that is performed in an especially solemn elaborate or formal way
activity: any specific behavior

ceremony (noun)	activity (noun)
the proper or conventional behavior on some solemn occasion	any specific behavior
any activity that is performed in an especially solemn elaborate or formal way	the trait of being active; moving or acting rapidly and energetically
a formal event performed on a special occasion	an organic process that takes place in the body
	a process existing in or produced by nature (rather than by the intent of human beings)
	the state of being active
	(chemistry) the capacity of a substance to take part in a chemical reaction