MIPS vs million instructions per second

MIPS and million instructions per second both are nouns.

Word	Noun	Adjective	Verb	Adverb
MIPS	Yes	No	No	No
million instructions per second	Yes	No	No	No

As nouns, MIPS and million instructions per second are synonyms defined as:

MIPS and million instructions per second: (computer science) a unit for measuring the execution speed of a computer's CPU (but not the whole system)

MIPS (noun)	million instructions per second (noun)
(computer science) a unit for measuring the execution speed of a computer's CPU (but not the whole system)	(computer science) a unit for measuring the execution speed of a computer's CPU (but not the whole system)