A tongue twister is a phrase or sentence that is difficult to say, often due to its repetitive or complex nature. There are several synonyms for this term, including mouthful, articulation challenge, diction test, pronunciation puzzle, and verbal obstacle course. These phrases all describe the same idea: something that challenges your ability to speak clearly and accurately. Whether you're a public speaker, actor, or just someone who likes to have fun with language, tongue twisters can be a great way to practice your diction and improve your communication skills. So next time you come across a tricky phrase, remember that it's just another tongue twister waiting for you to master it!