Funnelform is a term used to describe a shape that is wide at the top and narrow at the bottom, resembling a funnel. There are several synonyms that can be used to describe such a shape. One of the most common synonyms is "conical", which refers to a shape that tapers towards a point. Another synonym is "pyramidal", which refers to a shape that has a pyramidal structure, with a broad base and a pointed apex. "Tapered" is another synonym that describes a shape that narrows towards one end. Lastly, "truncated" is a synonym used to describe a shape that has straight sides and a flat top or base, as if a part of the original shape has been cut off.