"Purple" is more like some kind of Magenta while "Magenta" is more like some sort of MAuve and Mauve a Purple... and so on.
"White" is actually grey while "bright whitwhite"e is white...
Cyan is quite mixable with blues, and lighter Cyan are also lighter blues.
*while the CPC palette actually have perhaps 5 shades of green, a "good" Green gradiant from black to white can't use that many colours... Because 4 "green" shades are too close.
Yet this can be used for a more subtle approach, and yellows actually mix well with some "Greens"
*CPC palette and ditherings