color names
What of the names given to the colors of the visible spectrum, which includes blue, indigo, and violet, three distinct colors which most people would lump together under "blue". This also makes my point that violet is akin to blue, not to red, to which purple is akin. In other words, purple is a reddish hue, violet is a bluish hue, but people keep using the term "purple" when they mean "violet".