An alarmist is someone who tries to make other people very worried about dangers that, in the speaker’s view, are not real, or not as big as they sound. It is almost always a criticism, not a job title. If I call your warning alarmist, I am not thanking you; I am saying you are making a drama out of something thin. You can use it as a noun (He is an alarmist) or as an adjective (alarmist headlines, an alarmist report). Newspapers and politicians throw this word at each other. Though actually, the word does not prove the danger is fake. It only tells you the speaker thinks the fear is too much. One person’s alarmist is another person’s early warning.