What you're referring to is usually called a spectral color. It's the most common form of color, but it's not the entirety of the term. Whites and grays are the

What you're referring to is usually called a spectral color. It's the most common form of color, but it's not the entirety of the term. Whites and grays are the achromatic colors. Metameric colors can have different spectra even when they look identical. You're probably familiar with magenta, a color that has no monochromatic wavelength. More exotic is stygian blue, a color that has no wavelengths at all. Different people don't perceive the same wavelengths identically either. For example, colorblindness exists and there are genes which slightly shift the opsin sensitivity curves in your eyes. Color is a very, very deep rabbit hole.