Because the vibrator and gyrator both involve a weight spinning off-center, a gyrating sex toy's spinning weight is many times heavier than in a vibrator. The resulting gyrating motion can be used to stimulate the nerve-rich, interior clitoris.
More About Gyrating Sex Toy
Example of a gyrating vibrator. Pictured: Evolved Gyro Vibe.
In a gyrating vibrator, the rotation happens inside the vibrator. A rotating motor is weighted to one side and throws its weight around in a way that delivers a thumping motion rather than a typical vibration. The deeper, rumbling it produces are believed to more deeply stimulate the clitoris, p-spot, or G-spot, resulting in more intense orgasms.