|(Like my brain can differentiate this beautiful mess)|
The problem is not being corrected, it's remembering which is which even after the many, many reminders. Kind of like recognizing a face but not being able to put a name to it. Guess what? Google knows the difference! Of course, right.
Not only did I find an explanation, I found this paint chip photo. The definition may help: aqua-blue water; turquoise-light blue with some greenish; teal-dark blue-green.
Notice that Pinterest doesn't distinguish among the colors. If you search aqua, teal, or turquoise, you'll get all three, so maybe the mnemonic may be of use after all.