memorialisation vs ceremony

memorialisation and ceremony both are nouns.

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

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

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

memorialisation (noun)	ceremony (noun)
a ceremony to honor the memory of someone or something	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