coulomb vs ampere-second

coulomb and ampere-second both are nouns.

Word	Noun	Adjective	Verb	Adverb
coulomb	Yes	No	No	No
ampere-second	Yes	No	No	No

As nouns, coulomb and ampere-second are synonyms defined as:

coulomb and ampere-second: a unit of electrical charge equal to the amount of charge transferred by a current of 1 ampere in 1 second

Other synonyms of coulomb include C.

coulomb (noun)	ampere-second (noun)
a unit of electrical charge equal to the amount of charge transferred by a current of 1 ampere in 1 second	a unit of electrical charge equal to the amount of charge transferred by a current of 1 ampere in 1 second