You might have had the impression that women can see and name more colors than men. You are actually right.
Ten percent of men have some kind of color deficienc: mostly, they cannot distinguish red from green. Color blindness is easy to test: can you see the numbers below? If not, you have some degree of color deficiency.
Yet, how is it that women distinguish more colours than men? You can take a test yourself here:
The scientific explanation lies in the receptors we have in the eyes. Human usually have three receptors: one which distinguish black and white, one for blue and yellow, and the third recept distinguishes red from green (sometimes). Apparently some women can have up to 4 receptors!