When it comes to the support axle, there are several synonyms that might come up. An axle is a central shaft that rotates and on which wheels or other gears can be mounted, so a support axle would be a part that helps to steady or steady that central shaft. Some other terms that could be used interchangeably with support axle might include bearing, spindle, pivot, axle shaft, or even stabilizer. Depending on the context, other terms that might be used could include brace or strut, especially if additional support is needed to keep something steady or balanced. Ultimately, the right synonym for support axle will depend on the specific use case and the nature of the machinery or equipment in question.