IPA: /ɪnˈsɛndɪəˌrɪzəm/
KK: /ɪnˈsɛndɪərɪzəm/
The act of deliberately setting fire to property or causing fires, often for malicious purposes.
The authorities arrested him for incendiarism after he was caught setting fire to the abandoned building.
Incendiarism → It is formed from "incendere" (meaning to set on fire) and the suffix "-ism" (indicating a practice or condition). The word refers to the practice or condition of deliberately setting fires, especially in a malicious context.
Think of 'setting on fire' ('incendere') as the core idea, and remember that 'incendiarism' refers to the act of deliberately causing fires.
No commonly confused words.