ampere-minute vs charge unit

ampere-minute and charge unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
ampere-minute	Yes	No	No	No
charge unit	Yes	No	No	No

As nouns, charge unit is a hypernym of ampere-minute; that is, charge unit is a word with a broader meaning than ampere-minute:

ampere-minute: a unit of charge equal to 60 coulombs
charge unit: a measure of the quantity of electricity (determined by the amount of an electric current and the time for which it flows)

Other hypernyms of ampere-minute include quantity unit.

ampere-minute (noun)	charge unit (noun)
a unit of charge equal to 60 coulombs	a measure of the quantity of electricity (determined by the amount of an electric current and the time for which it flows)