catch some Z's vs kip

catch some Z's is not a noun while kip is a noun.

Word	Noun	Adjective	Verb	Adverb
catch some Z's	No	No	Yes	No
kip	Yes	No	Yes	No

As verbs, catch some Z's and kip are synonyms defined as:

Other synonyms of catch some Z's include log Z's, sleep, slumber.

catch some Z's (noun)	kip (noun)
	a gymnastic exercise performed starting from a position with the legs over the upper body and moving to an erect position by arching the back and swinging the legs out and down while forcing the chest upright
	the basic unit of money in Laos
	sleep

catch some Z's (verb)	kip (verb)
be asleep	be asleep