sleepover vs occasion

sleepover and occasion both are nouns.

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

As nouns, occasion is a hypernym of sleepover; that is, occasion is a word with a broader meaning than sleepover:

sleepover: an occasion of spending a night away from home or having a guest spend the night in your home (especially as a party for children)
occasion: a formal or official social gathering or ceremony of people

Other hypernyms of sleepover include affair, function, social affair, social function, social gathering, social occasion.

sleepover (noun)	occasion (noun)
an occasion of spending a night away from home or having a guest spend the night in your home (especially as a party for children)	an event that occurs at a critical time
	a formal or official social gathering or ceremony of people
	a rational motive for a belief or action
	an opportunity to do something
	the time of a particular event

sleepover (verb)	occasion (verb)
	give occasion to