amplitude distortion vs nonlinear distortion

amplitude distortion and nonlinear distortion both are nouns.

Word	Noun	Adjective	Verb	Adverb
amplitude distortion	Yes	No	No	No
nonlinear distortion	Yes	No	No	No

As nouns, amplitude distortion and nonlinear distortion are synonyms defined as:

amplitude distortion and nonlinear distortion: distortion that occurs when the output signal does not have a linear relation to the input signal

amplitude distortion (noun)	nonlinear distortion (noun)
distortion that occurs when the output signal does not have a linear relation to the input signal	distortion that occurs when the output signal does not have a linear relation to the input signal