system call vs supervisor call instruction

system call and supervisor call instruction both are nouns.

Word	Noun	Adjective	Verb	Adverb
system call	Yes	No	No	No
supervisor call instruction	Yes	No	No	No

As nouns, system call and supervisor call instruction are synonyms defined as:

system call and supervisor call instruction: an instruction that interrupts the program being executed and passes control to the supervisor

system call (noun)	supervisor call instruction (noun)
an instruction that interrupts the program being executed and passes control to the supervisor	an instruction that interrupts the program being executed and passes control to the supervisor