Pls get to know that the two items are totally different. Now and here I will tell you some easy way to distinguish these two words. You can now look at your own eyes in the mirror; the pupil is the black hole in the center of the eye, and the iris is the colored circle, which surround the pupil. Of course, you can get to know the difference by the function of the two parts of eyes. The pupil has the function of allowing the light outside to enter the eye. However, the iris is just a muscle controlling the size of the pupil so that the iris can limit the amount of the light entering our eyes. The iris plays an important role in our eyes, namely, if too much light enters into your eye, which will result in the hurt of light sensitive proteins; if you do not get enough light, you will not see clearly, when your pupil will get larger or dilate in low light.
