Electrotherapy refers to the use of electrical stimulation for therapeutic purposes. However, there are other words that can be used interchangeably with electrotherapy. One of them is "electrical stimulation therapy". This term is commonly used in clinical settings and physical therapy practices. Additionally, "non-invasive neuromodulation" can also be used to describe electrotherapy since it involves the modulation of nerves without the need for invasive measures. Other possible synonyms include "electric current therapy", "shockwave therapy", and "bioelectric therapy". Ultimately, these different terms all refer to the use of electricity for therapeutic purposes in promoting healing and pain relief.