Every single color is either a primary, secondary, or tertiary color. Within each color, there are different degrees of saturation ( how vivid or pale it can be ) many of which have a different or two color inclusive names.
There is a cadmium red, cadmium red light, cadmium medium red, etc', each of which becomes a different shade of the color depending upon the amount or lack thereof, of color saturation, which then becomes A SHADE OF THAT COLOR and sometimes then has a different or multiple names.
Then there are such colors as Phylo Blue, Phylo Blue GREEN SHADE, and Phylo Bule RED SHADE, for further examples.
You actually misused the word "HUE". "Family" might be a better term; however that word isn't quite right either, but will do.
Violet, lavender, and purple are members of the same "family". SOME ARE "WARM COLORS, SOME ARE "COOL" COLORS; however, they are distinct colors, have their own names, while still being a "shade" of another/secondary color.
And BLACK is NOT added to darken all colors, it isn't used that way at all; not ever!
“You actually misused the word “HUE”. “
I used it correctly.
“And BLACK is NOT added to darken all colors, it isn’t used that way at all; not ever!”
Black is added to make different shades of a color. A COLOR. The color doesn’t.
Ergo, violet is not a shade of purple as you stated.