sound unit vs sone

sound unit and sone both are nouns.

Word	Noun	Adjective	Verb	Adverb
sound unit	Yes	No	No	No
sone	Yes	No	No	No

As nouns, sone is a hyponym of sound unit; that is, sone is a word with a more specific, narrower meaning than sound unit:

sound unit: any acoustic unit of measurement
sone: a unit of perceived loudness equal to the loudness of a 1000-hertz tone at 40 dB above threshold

Other hyponyms of sound unit include B, Bel, dB, decibel, phon.

sound unit (noun)	sone (noun)
any acoustic unit of measurement	a unit of perceived loudness equal to the loudness of a 1000-hertz tone at 40 dB above threshold