1. A questioner.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• interrigators,
• interogator,
• interrigator,
• interregator,
• interogators,
• interrogater,
• interrogaters,
• interrogatin,
• interigator,
• interragator,
• interrogaton,
• unterrogator,
• jnterrogator,
• knterrogator,
• onterrogator,
• 9nterrogator,
• 8nterrogator,
• ibterrogator,
• imterrogator,
• ijterrogator

• international,
• interrelate,
• interceptor,
• interrogatory,
• interpolate,
• interlocutor,
• intercalation,
• interrupted,
• interrogation,
• interpolation,
• interior door,
• interstate,
• interlocutory,
• interpersonal,
• interregnum,
• interrelated,
• interrelation,
• interrogative,
• interrogate,
• interruption,
• interoceptor,
• interracial,
• interrogatively,
• interrupt,
• interfering,
• interrupter,
• internationale,
• intermediator,
• interstratify,
• intercalate,
• internationally.

The adjective form of the word "interrogator" is "interrogative".

The plural of the "interrogator" can be the "interrogators".

The singular of the "interrogator" can be the "interrogator".