What color is Hazel exactly in eyes?

So Hazel eyes description isn't exactly clear, so I have Hazel eyes and took the pigment and the color of them (shown on the picture attached) look like a dark olive color dont they? like a dark shade of green? Hazel isn't even a color and I don't know why they call them hazel then? So is Hazel just a... show more So Hazel eyes description isn't exactly clear, so I have Hazel eyes and took the pigment and the color of them (shown on the picture attached) look like a dark olive color dont they? like a dark shade of green? Hazel isn't even a color and I don't know why they call them hazel then? So is Hazel just a olive color then? I wonder if I can put on my state ID Olive as eye color?
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