A music synthesizer is an electronic device that can create sounds and music. If you're looking for synonyms to describe this device, you might consider "synth," "electronic keyboard," or "digital sound generator." Each of these terms can be used to describe a device that uses electronic components to produce musical sounds. Other synonyms might include "virtual instrument," "digital audio workstation," or "sound module." Depending on the context and the specific type of synthesizer you're referring to, you might also consider terms like "analog synth," "sequencer," or "sample-based synthesizer." Ultimately, there are many words that can be used to describe this versatile and creative musical instrument.