IPA: /ɪnˈtɛrəˌɡeɪtə/
KK: /ɪnˈtɛrəˌɡeɪtər/
A person who asks questions, especially in a formal or official context, often to gather information or clarify details.
The interrogator asked the suspect several questions to get to the truth.
Interrogator → It is formed from "inter-" (meaning between) and "rogare" (meaning to ask). The word describes someone who asks questions, often in a formal or investigative context, thus acting between the questioner and the subject.
Think of someone who is 'asking' ('rogare') questions 'between' people ('inter-') — that's why an interrogator is someone who asks questions.