WordNet records no synonym and no antonym for monotype. 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.
(biology) a taxonomic group with a single member (a single species or genus)
the sole print made by pressing paper against a painted or inked glass or metal plate
a typesetting machine operated from a keyboard that sets separate characters
Synonyms, antonyms and the broader and narrower relations for monotype come from Princeton University’s WordNet. Full sources and licences.