occasion vs crisis

occasion and crisis both are nouns.

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

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

occasion (noun)	crisis (noun)
an event that occurs at a critical time	a crucial stage or turning point in the course of something
a formal or official social gathering or ceremony of people	an unstable situation of extreme danger or difficulty
a rational motive for a belief or action
an opportunity to do something
the time of a particular event

occasion (verb)	crisis (verb)
give occasion to