Is nut countable noun or not?

"Nut" can be both a countable and an uncountable noun, depending on the context.

Countable:

* When referring to individual nuts, it's countable.

* *Example:* "I ate three nuts."

* *Example:* "There are many nuts in this bowl."

Uncountable:

* When referring to nuts in general, as a substance, it's uncountable.

* *Example:* "We need to buy some nut butter."

* *Example:* "This recipe calls for nut flour."

So, the answer is: It depends on the context!