Stevens' power law vs Stevens' law

Stevens' power law and Stevens' law both are nouns.

Word	Noun	Adjective	Verb	Adverb
Stevens' power law	Yes	No	No	No
Stevens' law	Yes	No	No	No

As nouns, Stevens' power law and Stevens' law are synonyms defined as:

Stevens' power law and Stevens' law: (psychophysics) the concept that the magnitude of a subjective sensation increases proportional to a power of the stimulus intensity

Other synonyms of Stevens' power law include power law.

Stevens' power law (noun)	Stevens' law (noun)
(psychophysics) the concept that the magnitude of a subjective sensation increases proportional to a power of the stimulus intensity	(psychophysics) the concept that the magnitude of a subjective sensation increases proportional to a power of the stimulus intensity