WordNet records no synonym and no antonym for toner. 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 solution containing chemicals that can change the color of a photographic print
a black or colored powder used in a printer to develop a xerographic image
a lotion for cleansing the skin and contracting the pores
Synonyms, antonyms and the broader and narrower relations for toner come from Princeton University’s WordNet. Full sources and licences.