General thirst:
* Thirst: This is the most straightforward option, but it can also be used as a verb.
* Dryness: This emphasizes the physical sensation of thirst.
* Dehydration: This refers to the lack of water in the body.
Specific types of thirst:
* Craving: This implies a strong desire for something specific, like a drink.
* Hunger: While technically referring to food, it can sometimes be used metaphorically to describe a strong desire for something else, including a drink.
* Avidity: This refers to a strong, almost insatiable desire for something.
Figurative use of thirst:
* Yearning: This implies a deep longing for something.
* Desire: This can be used to describe a strong desire for anything, including knowledge, power, or love.
The best noun for "thirsty" will depend on the context of your sentence.