The word "creakier" means something that makes a high-pitched sound when it moves. Its antonyms are words that mean the opposite. These include "silky," which means smooth and noiseless; "quiet," which means a lack of noise, and "peaceful," which means calm and tranquil. "Stable" is another antonym for "creakier," meaning something that is firm and unwavering, while "secure" refers to something that is safe and protected. Finally, "steady" can also be an antonym for "creakier," meaning something that is balanced and consistent without any irregularities or shakiness.