Rickenbacker is a proper noun commonly associated with the iconic American guitar manufacturer, Rickenbacker International Corporation. Synonyms for the word Rickenbacker are challenging to find as the brand name is unique and distinct. Even so, a few possible synonyms could be "guitar," "musical instrument," or "electric guitar." It is important to remember that Rickenbacker guitars come in various shapes and models, making it difficult to use synonyms that would fit every type of guitar they produce. However, it could be possible to use alternative phrases such as "Rickenbacker-style" or "Rickenbacker-inspired" to describe other guitars with similar specifications or aesthetics.