architecture has 1 distinct synonym spread across 1 of its 4 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 discipline dealing with the principles of design and construction and ornamentation of fine buildings
“architecture and eloquence are mixed arts whose end is sometimes beauty and sometimes use”
the profession of designing buildings and environments with consideration for their esthetic effect
(computer science) the structure and organization of a computer's hardware or system software
“the architecture of a computer's system software”
Synonyms, antonyms and the broader and narrower relations for architecture come from Princeton University’s WordNet. Full sources and licences.