watt second vs joule

watt second and joule both are nouns.

Word	Noun	Adjective	Verb	Adverb
watt second	Yes	No	No	No
joule	Yes	No	No	No

As nouns, watt second and joule are synonyms defined as:

watt second and joule: a unit of electrical energy equal to the work done when a current of one ampere passes through a resistance of one ohm for one second

Other synonyms of watt second include J.

watt second (noun)	joule (noun)
a unit of electrical energy equal to the work done when a current of one ampere passes through a resistance of one ohm for one second	a unit of electrical energy equal to the work done when a current of one ampere passes through a resistance of one ohm for one second