cash cow vs money-spinner

cash cow and money-spinner both are nouns.

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

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

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

Other synonyms of cash cow include moneymaker.

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