Have you a superfluity of nounage?

See, I can remember things like 'superfluity' and fail utterly to remember what the right word might be for, like, those things, they have them next to booths where they check your identity before they let you in, and they pivot around one end, and are often painted orange and white or have blinkenlights on them or something, and I've got this lovely hand gesture to explain what they are only I don't seem to be able to make it and type at the same time.

You know. Substantives.