IPA: /ɪmˈprɒvɪzeɪtə/
KK: /ɪmˈprɑːvɪzeɪtər/
A person who creates or performs something spontaneously without preparation, often in music, theater, or other artistic contexts.
The improvisator captivated the audience with his spontaneous jazz performance.
Improvisator → It is formed from "improvisus" (from Latin, meaning unprepared) and the suffix "-ator" (meaning one who does). The word refers to one who performs or creates spontaneously without preparation.
Think of someone who is 'unprepared' ('improvisus') and is 'doing' something ('-ator') on the spot — that's what an improvisator does.