” Circular Reasoning ” is a form of faulty reasoning, so “half-circular words” suggests to me that the words are being used to sort of make circulars (faulty/deceptive) arguments. The abstract nature of the words would match the shape of a table if you just look at their shapes and symbols. It is great.

A common and basic usage of terms : e.g. to talk in circles, to “beat around the bush” or to eat and eat food and drink,- are also suggested as synonyms — to

talk in an indirect, unproductive and possibly deceptive manner.