nap vs log Z's

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

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

As verbs, log Z's is a hypernym of nap; that is, log Z's is a word with a broader meaning than nap:

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

nap (noun)	log Z's (noun)
sleeping for a short period of time (usually not in bed)
a card game similar to whist; usually played for stakes
the yarn (as in a rug or velvet or corduroy) that stands up from the weave
a soft or fuzzy surface texture
a period of time spent sleeping

nap (verb)	log Z's (verb)
take a siesta	be asleep