What is 'discriminating wisdom' in the early Buddhist texts?

I have been discussing online whether there is a counterpart to the Greek idea of 'nous' (intellect) in the early Buddhist texts. The discussion was about discriminating between sensory experience and rational thought. I was arguing that there is a clear distinction between sensory and rational faculties in Greek philosophy. Then someone said, what about in Buddhism, where 'manas' is given as one of the six sense gates? Doesn't this mean that Buddhism equates manas and sensory faculties? I said, no, because there is the faculty that 'discerns the dharma' which is not a sensory faculty but discriminative wisdom. The word that came to mind was the Sanskrit 'viveka', for which I found the definition 'Sense of discrimination; wisdom; discrimination between the real and the unreal, between the self and the non-self, between the permanent and the impermanent; discriminative inquiry; right intuitive discrimination; ever present discrimination between the transient and the permanent.' However, I'm not aware of much discussion of this in the texts. I'm wondering if there's any discussion in abhidharma texts of this distinction and the faculty of discriminative wisdom?