systems software vs systems program

systems software and systems program both are nouns.

Word	Noun	Adjective	Verb	Adverb
systems software	Yes	No	No	No
systems program	Yes	No	No	No

As nouns, systems software and systems program are synonyms defined as:

systems software and systems program: a program (as an operating system or compiler or utility program) that controls some aspect of the operation of a computer

Other synonyms of systems software include system program.

systems software (noun)	systems program (noun)
a program (as an operating system or compiler or utility program) that controls some aspect of the operation of a computer	a program (as an operating system or compiler or utility program) that controls some aspect of the operation of a computer