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/ˈɑɹsənəst/ · noun
One who has committed the act of arson, or illegally setting fire to property..
Use arsonist when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Arsonist means One who has committed the act of arson, or illegally setting fire to property..
Common synonyms include incendiarist, incendiary, firebug.
The opposite depends on the specific sense.
Use arsonist where its definition matches the intended context.
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