What are the main differences between a contralto and a tenor voice in terms of vocal range and timbre?

The main difference between a contralto and a tenor voice is in vocal range and timbre. A contralto typically has a lower vocal range, singing in the lower register, while a tenor has a higher vocal range, singing in the higher register. In terms of timbre, a contralto has a darker and richer tone, while a tenor has a brighter and more resonant tone.