2. The word mole has two homophones that distract beginners from learning its technical meaning in chemistry. One meaning is a small burrowing, insectivorous mammal that creates tunnels near the surfaces of lawns; the National Mole Day idea for high school students in Australia uses a mole as a mascot. Another meaning is a spy inside the opposing country's own spy agency (figuratively underground, burrowing like the animal mole). A third meaning is a dark spot on the skin, sometimes also called a "beauty mark" when it is attractively placed on the face. You might be able to make a joke using these homophones.