"Old war horses" is a phrase used to describe experienced individuals, particularly in politics or the military. However, there are several synonyms that can be used to describe these seasoned veterans. Some of them include: seasoned professionals, veterans, experienced players, seasoned campaigners, battle-scarred soldiers, battle-tested warriors, skilled experts, and proven leaders. These synonyms highlight the idea that these individuals have years of experience, have faced many challenges, and have proven themselves to be reliable and capable. These phrases can be used interchangeably with "old war horses" to emphasize the same level of experience and expertise.