もやす
もやす · moyasu · JLPT N2 · verb-godan
to burn
🔥 燃やす = 燃ゆ (moyu, to burn) + causative -su: to make something burn
Built from classical 燃ゆ (moyu, to burn) plus the causative ending -su, so it means to set something on fire. Contrast intransitive 燃える (moeru), where the thing burns by itself.