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radius has 3 distinct synonyms spread across 2 of its 5 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the length of a line segment between the center and circumference of a circle or sphere
a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
Synonyms, antonyms and the broader and narrower relations for radius come from Princeton University’s WordNet. Full sources and licences.
a circular region whose area is indicated by the length of its radius
“they located it within a radius of 2 miles”
the outer and slightly shorter of the two bones of the human forearm
support consisting of a radial member of a wheel joining the hub to the rim