interior decoration has 2 distinct synonyms spread across 2 of its 2 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.
decoration consisting of the layout and furnishings of a livable interior
the trade or act of decorating the interior of a building or room, especially with regard to color combination, paint, fabrics, carpeting, etc.
Synonyms, antonyms and the broader and narrower relations for interior decoration come from Princeton University’s WordNet. Full sources and licences.