is a specific kind of: sleeping.

is a broader term that covers: siesta | zizz.

derivation: doze, drowse, snooze | catch a wink, catnap^v1, nap.

domain usage: colloquialism.

is a specific kind of: catch some Z's, kip, log Z's, sleep, slumber.

is a broader term that covers: doze, drowse, snooze.

derivation: catnapⁿ¹, forty winks, light sleep, nap, short sleep, snooze | nap, sleep.