subprogram vs computer software

subprogram and computer software both are nouns.

Word	Noun	Adjective	Verb	Adverb
subprogram	Yes	No	No	No
computer software	Yes	No	No	No

As nouns, computer software is a hypernym of subprogram; that is, computer software is a word with a broader meaning than subprogram:

subprogram: a set sequence of steps, part of larger computer program
computer software: (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

Other hypernyms of subprogram include package, software, software package, software program, software system.

subprogram (noun)	computer software (noun)
a set sequence of steps, part of larger computer program	(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