loss vs red ink

loss and red ink both are nouns.

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

As nouns, loss and red ink are synonyms defined as:

loss and red ink: the amount by which the cost of a business exceeds its revenue

Other synonyms of loss include red.

loss (noun)	red ink (noun)
the act of losing someone or something	the amount by which the cost of a business exceeds its revenue
the disadvantage that results from losing something
military personnel lost by death or capture
the experience of losing a loved one
euphemistic expressions for death
the amount by which the cost of a business exceeds its revenue
something that is lost
gradual decline in amount or activity