"I hate this war."
"Me too. It's bad for everyone"
"But you know who is profiting from this - the coffin seller."
How do I define that coffin seller in one or more words?
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I believe in this instance the word you need is Vulture. Vultures are found in nature feeding upon the dead and dying and thus gaining life at the expense of others. If you wish to convey someone who feeds upon the living at their expense a closer match would be Vampire. Both of these words have been used to refer to people who profit from the suffering of others.