[.Been cooke] What is so frightening about "keywords" from the Scrum guide to you?
There's nothing wrong with asking a candidate to explain something in plain, simple language, as you want an idea of how they can relate to people they may encounter in their work.
Specifically, asking them to exclude language from a deliberately simplistic guide might have them missing the purpose of the question.
I was at a client away day once, where the local agile community had prepared a speech. Beforehand, they said to the audience, "We're going to include three practices in our speech that aren't agile. At the end, we'll ask you to tell us what they are".
Some of the room got the practice but didn't pay attention to anything else they said in the speech, including the useful stuff. The rest didn't know enough to participate in the game and were baffled by the whole exercise.
The 10-15 minutes this took contributed nothing to the day's purpose except the growing alienation of the profession inside that large organisation.