The tertiary color names are easy, they are just a list of the two other colors that were used to make it. The trick is to always put the primary name first and the tertiary second, yellow-orange for example. You'd never have an orange-yellow, because once a primary color is contaminated with anything other than itself, it is no longer the primary. It may be a very yellow orange, but it is still an orange.
If they lay out their colors in order, they should be able to tell if their colors progress in even steps. If there is a sudden jump, students try to mix a color that would be a better blend of the 2 colors it falls between.
All of these steps make for a more professional looking color wheel, that can be used not only to teach primary, secondary, and tertiary colors, but later be used to refer to to teach complimentary, triadic and analogous color schemes. (P.S. I don't exempt my blind students from this project. Although I help in mixing the colors, they are responsible for telling me which colors to mix to make the desired color. They paint (sometimes braille) and glue the cards themselves.