paper loss vs red ink

paper loss and red ink both are nouns.

Word	Noun	Adjective	Verb	Adverb
paper loss	Yes	No	No	No
red ink	Yes	No	No	No

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

paper loss: an unrealized loss on an investment calculated by subtracting the current market price from the investor's cost
red ink: the amount by which the cost of a business exceeds its revenue

Other hypernyms of paper loss include loss, red.

paper loss (noun)	red ink (noun)
an unrealized loss on an investment calculated by subtracting the current market price from the investor's cost	the amount by which the cost of a business exceeds its revenue