Guitar hero is a term commonly used to describe someone who is skilled in playing the guitar. However, this phrase can be substituted with a variety of other words that convey similar meanings. For example, one could use the term "guitar virtuoso" to describe someone who is particularly skilled or accomplished in playing the guitar. Other possible synonyms include "guitarist extraordinaire," "guitar master," and "guitar wizard." Each of these phrases can be used to denote a high level of skill or expertise in playing the guitar, and can be used interchangeably with the term "guitar hero".