FWIW, I’m not sure that tracks entirely, and that’s accounting for my own years training in various analog and digital art media. For most US English-speaking humans (if not universally^{[1](https://en.wikipedia.org/wiki/Colorimetry)}, minus linguistic^{[2](https://en.wikipedia.org/wiki/Linguistic_relativity_and_the_color_naming_debate), [3](https://onlinelibrary.wiley.com/doi/abs/10.1002/col.22955)} and biological^{[4](https://physicstribune.com/light/visible-light/)} differences, [per Oklab^{[5](https://en.wikipedia.org/wiki/Oklab_color_space)}]), the modern understanding of subtractive color^{[6](https://library.si.edu/exhibition/color-in-a-new-light/science)} (ie. [reflected] vs additive [light]) holds that :

• “Primary” blue == “proper” blue— it’s in the name, heh. ☺️
• Navy & Royal are near neighbors, differing in both shade and saturation;
• Robins egg, sky, and electric mostly differ by shade and slightly in hue (+luminance/vibrance for electric), and
• Turquoise, ironically^{[7](https://www.researchgate.net/figure/The-top-turquoise-samples-possess-pure-blue-with-slight-colour-variation-The-bottom-15_fig1_348996929)}, is nearly centered between primary blue & secondary green, while the stone is historically renowned for its incredible vibrance in its chromatic variance. (blue to yellow^{[8](https://www.gia.edu/turquoise/gem-research)})

It’s crazy out there in color land! 🤣