Question

I belive you are hungry.(noun form of hungrya)

Answer 1

Noun form of hungry is hunger.

If you want to change this sentence with noun form of hungry, the sentence would be :-

I believe you have hunger.

Since hunger is noun, we have to use the word 'have'

Hope it helps dear friend ☺️✌️

Answer 2

The noun form of hungry is : hunger
And ur statement :
I beleive you feel hunger.....