system program vs systems software

system program and systems software both are nouns.

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

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

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

Other synonyms of system program include systems program.

system program (noun)	systems software (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