is a specific kind of: elimination, evacuation, excreting, excretion, voiding.

is a broader term that covers: leak, making water, passing water, wetting | lithuresis | nocturia, nycturia | oliguria | pee, peeing, piss, pissing.

derivation: make, make water, micturate, pass water, pee, pee-pee, piddle, piss, puddle, relieve oneself, spend a penny, take a leak, urinate, wee, wee-wee.