Hi Moonrider. Firstly, there is some ambiguity around the use of the word intuition. In the Jungian sense it corresponds to the element fire (fire=intuition, earth=sensation, air=thinking and water=feeling). But people often use it in a more watery way too.
I think the word intuition gets used for both fire and water because both elements are to do with following a personal impulse. Fire is about personal impulses that guide us to simply be our unique self and thus bring unrealised potential to fruition. Water is to do with personal impulses that guide us to connect more deeply to the larger life of which we are part.
Cancer intuition guides us to generate maternal bonds between oneself and other individuals (or any other form we wish to nurture).
Scorpio intuition knows how to break down the barriers between individuals, and often fears the implications of the precariousness of interpersonal barriers.
Pisces intuition tries to connect to the larger life directly, seeing what needs to be redeemed in order to make this connection, and going through cycles of enchantment and disillusionment where some phenomenon/form is wrongly seen as having the power to redeem.