money-spinner vs cash cow

money-spinner and cash cow both are nouns.

Word	Noun	Adjective	Verb	Adverb
money-spinner	Yes	No	No	No
cash cow	Yes	No	No	No

As nouns, money-spinner and cash cow are synonyms defined as:

money-spinner and cash cow: a project that generates a continuous flow of money

Other synonyms of money-spinner include moneymaker.

money-spinner (noun)	cash cow (noun)
a project that generates a continuous flow of money	a project that generates a continuous flow of money