nanovolt vs potential unit

nanovolt and potential unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
nanovolt	Yes	No	No	No
potential unit	Yes	No	No	No

As nouns, potential unit is a hypernym of nanovolt; that is, potential unit is a word with a broader meaning than nanovolt:

nanovolt: a unit of potential equal to one billionth of a volt
potential unit: a measure of the potential energy of a unit charge at a given point in a circuit relative to a reference point (ground)

nanovolt (noun)	potential unit (noun)
a unit of potential equal to one billionth of a volt	a measure of the potential energy of a unit charge at a given point in a circuit relative to a reference point (ground)