渇水【かっすい】
water shortage
枯渇【こかつ】
drying up, running dry, running out, being exhausted, being drained
渇き【かわき】
thirst, craving, thirst (for love, knowledge, etc.), hunger
渇望【かつぼう】
craving, longing, thirsting
渇く【かわく】
to be thirsty, to feel thirsty, to thirst for, to crave