Subprogram and Software program

Subprogram noun - A set sequence of steps, part of larger computer program.

Software program and subprogram are semantically related. In some cases you can use "Software program" instead a noun "Subprogram".

Software program noun - (computer science) written programs or procedures or rules and associated documentation pertaining to the operation of a computer system and that are stored in read/write memory.

Subprogram and software program are semantically related. Sometimes you can replace term "Subprogram" with "Software program", this terms are similar.