zizz vs catnap

zizz and catnap both are nouns.

Word	Noun	Adjective	Verb	Adverb
zizz	Yes	No	No	No
catnap	Yes	No	Yes	No

As nouns, catnap is a hypernym of zizz; that is, catnap is a word with a broader meaning than zizz:

Other hypernyms of zizz include forty winks, light sleep, nap, short sleep, snooze.

zizz (noun)	catnap (noun)
a nap	sleeping for a short period of time (usually not in bed)
a buzzing or whizzing sound

zizz (verb)	catnap (verb)
	take a siesta