kip vs log Z's

kip is a noun but log Z's is not a noun.

Word	Noun	Adjective	Verb	Adverb
kip	Yes	No	Yes	No
log Z's	No	No	Yes	No

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

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

kip (noun)	log Z's (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

kip (verb)	log Z's (verb)
be asleep	be asleep