arsonist
🇺🇸
/ˈɑːrsənɪst/
🇬🇧
/ˈɑːsənɪst/
A person who intentionally sets fire to property.
The arsonist was caught after the fire department investigated the suspicious blaze.
火災部門が怪しい火災を調査した後、放火犯は逮捕されました。