In my experience these two terms frequently confuse students.
For teaching purposes I am looking for some way to help students distinguish between them. One way might be to show that the statistical concepts map onto the terms in a way that matches their everyday meaning. Another way might be to suggest a mnemonic to students.
Of course your students should understand the concept, and examples are in order. But a few mnemonics might still be useful. Even though I've done mediation and moderation analyses, I use my mnemonics when I didn't work with the concepts in a while. Your students might encounter them even less once your class is over. And avoiding the terms altogether when they are in use in many fields doesn't seem like a useful solution either. I think I would draw the two models and say something along the lines of