scratching vs noise

scratching and noise both are nouns.

Word	Noun	Adjective	Verb	Adverb
scratching	Yes	No	No	No
noise	Yes	No	Yes	No

As nouns, noise is a hypernym of scratching; that is, noise is a word with a broader meaning than scratching:

scratching (noun)	noise (noun)
a harsh noise made by scraping	the quality of lacking any predictable order or plan
	incomprehensibility resulting from irrelevant information or meaningless facts or remarks
	the auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience
	a loud outcry of protest or complaint
	sound of any kind (especially unintelligible or dissonant sound)
	electrical or acoustic activity that can disturb communication

scratching (verb)	noise (verb)
	emit a noise