cash cow vs moneymaker

cash cow and moneymaker both are nouns.

Word	Noun	Adjective	Verb	Adverb
cash cow	Yes	No	No	No
moneymaker	Yes	No	No	No

As nouns, cash cow and moneymaker are synonyms defined as:

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

Other synonyms of cash cow include money-spinner.

cash cow (noun)	moneymaker (noun)
a project that generates a continuous flow of money	a project that generates a continuous flow of money
	someone who is successful in accumulating wealth