I suggest the de-implication of horn from antlers (it is currently not, nor should it be, implied the other way, either).
Horns are from the bovine family, whereas antlers are contained within the cervine; they do not appear similar, and are constructed differently enough to do away with this implication.
Quoting the US National Park Service:
'Antlers, on members of the deer family, are grown as an extension of the animal's skull. They are true bone and are a single structure They are generally found only on males. Antlers are shed and regrown each year.
Horns, found on pronghorn, bighorn sheep, bison, and many other bovine, are two-part structures. An interior of bone (also an extension of the skull) is covered by an exterior sheath grown by specialized hair follicles, as are your fingernails. In fact, your fingernails and the exterior sheath of horns are made of very similar materials.'
Updated