red ink vs amount of money

red ink and amount of money both are nouns.

Word	Noun	Adjective	Verb	Adverb
red ink	Yes	No	No	No
amount of money	Yes	No	No	No

As nouns, amount of money is a hypernym of red ink; that is, amount of money is a word with a broader meaning than red ink:

Other hypernyms of red ink include amount, sum, sum of money.

red ink (noun)	amount of money (noun)
the amount by which the cost of a business exceeds its revenue	a quantity of money