Installer is a term commonly used to describe someone who sets up or installs a certain device or application. There are many other words that can be used to replace the term installer, such as fitter, fixer, technician, installer-engineer, installer-applicator, and more. The word "fitter" is generally used to describe someone who installs mechanical or electrical systems in buildings, while "fixer" is used to describe someone who repairs or installs anything related to pipes or wiring. "Technician" can be used for people who specialize in a particular type of installation, and "installer-engineer" can describe someone who designs and installs complex systems. Finally, "installer-applicator" is used to describe someone who installs coatings or insulation, such as on walls or roofs.