Subroutines (Computer programs)

Functions (Computer programs)
Methods (Computer programs)
Procedures (Computer programs)
Routines (Computer programs)
Subprograms (Computer programs)

Wikipedia, Jan. 12, 2007 (Subroutine -- In computer science, a subroutine (function, method, procedure, or subprogram) is a portion of code within a larger program that performs a specific task and is relatively independent of the remaining code)
Wikipedia, Jan. 12, 2007 (Routine -- A section of a program that performs a particular task ... The term routine is synonymous with procedure, function, and subroutine)