The Free On-line Dictionary of Computing (30 December 2018):

linker
linkage editor
link editor
link loader

    (link editor, linkage editor, link loader)
   A program that combines one or more files containing object
   code from separately compiled program modules into a single
   file containing loadable or executable code

   This process involves resolving references between the
   modules and fixing the relocation information used by the
   operating system kernel when loading the file into memory to
   run it.

   Under Unix, the linker is called "ld" and object files
   have filename extension .o (object), .so (shared object), or
   .lib (library), and the resulting executable is called
   "a.out" by default.

   (2001-10-13)