shape has 28 distinct synonyms spread across 11 of its 11 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.
any spatial attributes (especially as defined by outline)
“he could barely make out their shapes”
the spatial arrangement of something as distinct from its substance
“geometry is the mathematical science of shape”
a concrete representation of an otherwise nebulous concept
“a circle was the embodiment of his concept of life”
the visual appearance of something or someone
“the delicate cast of his features”
the state of (good) health (especially in the phrases `in condition' or `in shape' or `out of condition' or `out of shape')
the supreme headquarters that advises NATO on military matters and oversees all aspects of the Allied Command Europe
Synonyms, antonyms and the broader and narrower relations for shape come from Princeton University’s WordNet. Full sources and licences.