Subroutine and Software

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

Software and subroutine are semantically related. In some cases you can use "Software" instead a noun "Subroutine".

Software 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.

Subroutine and software are semantically related. Sometimes you can replace term "Subroutine" with "Software", this nouns are similar.