bundle vs catch some Z's

bundle is a noun but catch some Z's is not a noun.

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

As verbs, catch some Z's is a hypernym of bundle; that is, catch some Z's is a word with a broader meaning than bundle:

Other hypernyms of bundle include kip, log Z's, sleep, slumber.

bundle (noun)	catch some Z's (noun)
a package of several things tied together for carrying or storing
a collection of things wrapped or boxed together
a large sum of money (especially as pay or profit)

bundle (verb)	catch some Z's (verb)
sleep fully clothed in the same bed with one's betrothed	be asleep
make into a bundle
compress into a wad
gather or cause to gather into a cluster