yes some words I beleive are ‘made up’ but many are related to more common phrases for shades such as ‘cinnamon’ etc. So it’s a case of selecting words that a customer might use as well as perhaps having a nice word as you say in the title as perhaps a ‘collection’ name.
I also use https://encycolorpedia.com/ (there are several others that are similar - just do search online for HEX color codes). They are very useful and give other colors that go along with the one you’re using. toning colors, and other paint colors by name that are similar. I use them for everything now. When you need to “add background” in Zazzle, go to the + sign and it will give you a box wherein you can input this 6-digit code - letters with some numbers.