Homonyms are two words that are spelled the same and sound the same but have different meanings. The word "homonym" comes from the prefix "homo-," which means the same, and the suffix "-nym," which means name. Therefore, a homonym is a word that has the same name as another word, meaning that the two words look and sound exactly alike.
A simple example of a homonym is the word "pen." This can mean both "a holding area for animals" and "a writing instrument." Another example is "book," which can mean "something to read" or "the act of making a reservation." In both cases, the sound and spelling are the same, and only the definition changes.