WordNet records no synonym and no antonym for stream of consciousness. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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.
a literary genre that reveals a character's thoughts and feeling as they develop by means of a long soliloquy
the continuous flow of ideas and feelings that constitute an individual's conscious experience
Synonyms, antonyms and the broader and narrower relations for stream of consciousness come from Princeton University’s WordNet. Full sources and licences.