IPA: /ˈdɛvəsteɪtə/
KK: /ˈdɛvəˌsteɪtər/
A person or thing that causes great destruction or damage.
The hurricane was a true devastator, leaving the town in ruins.
Devastator → It is formed from "devastare" (meaning to lay waste or destroy) and "-or" (meaning one who). The word "devastator" refers to one who lays waste or causes destruction.
Think of someone who 'destroys' ('devastare') — that's why a devastator is someone who causes destruction.
No commonly confused words.