occasion vs ceremony

occasion and ceremony both are nouns.

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

As nouns, ceremony is a hyponym of occasion; that is, ceremony is a word with a more specific, narrower meaning than occasion:

occasion (noun)	ceremony (noun)
an event that occurs at a critical time	the proper or conventional behavior on some solemn occasion
a formal or official social gathering or ceremony of people	any activity that is performed in an especially solemn elaborate or formal way
a rational motive for a belief or action	a formal event performed on a special occasion
an opportunity to do something
the time of a particular event

occasion (verb)	ceremony (verb)
give occasion to