system program vs systems program

system program and systems program both are nouns.

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

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

system program 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 system program include systems software.

system program (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