"Quatrefagess angle" is a term that might be difficult to find synonyms for, as it appears to be a specific phrase related to a specific subject. However, if we break down the term, "quatrefagess" refers to a four-sided figure or quadrilateral, while "angle" typically describes the space between two intersecting lines. Considering these meanings, some synonyms for "quatrefagess angle" could be "quadrilateral's corner", "four-sided shape's vertex" or "intersection point of intersecting lines within a quadrilateral". These alternatives aim to convey the same idea of the angle formed within a four-sided shape.