渇 （カツ） thirst

渇望 （カツボウ） craving, longing, thirsting

枯渇 （コカツ） drying up, running dry, running out, being exhausted, being drained

口渇 （コウカツ） thirst, dry mouth, -dipsia

渇く （かわく） to be thirsty, to feel thirsty, to thirst for, to crave