Say, you buy some new office furniture. You get the furniture parts delivered including the service to put the different parts - for example the desk top and the desk legs - together to complete furniture ready for usage.
Is the person who carries out this service called "Assembler"
, "Installer"
or "Fitter"
and is his service called "Assembly"
, "Installation"
or "Fitting"
? Are the words interchangeable? Do they have different connotations? Are there other contexts where they are not interchangeable?