supervisor call instruction vs system call

supervisor call instruction and system call both are nouns.

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

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

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

supervisor call instruction (noun)	system call (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