Someone who spreads fear, or needlessly raises the alarm.(noun)
To spread fear.(verb)
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Use "fearmonger" in a sentence
"I think everyone should have access to healthcare but there are better ways to do it, and demonizing everyone who opposes you makes you the name-calling fearmonger doesn't it?"
"I have been labelled a fearmonger for being concerned about an advocate of private health care being elected head of the Canadian Medical Association and was called a supporter of - I love this framing - "enforced state-run health care"."
"POLITICS: Liberals are quick with 'fearmonger' label"