Here are the words matched with their descriptions:
- Diuretic - something that speeds up the process of elimination of water and waste through the kidneys.
- Hyponatremia - the condition endurance athletes sometimes suffer from water intoxication.
- Urine output - glasses of water lost each day from normal kidney filtration.
(Note: Since it seems like the third item describes a concept rather than a single word, "urine output" is the most appropriate term to match it.)