WordNet records no synonym and no antonym for methyltestosterone. It is the only member of its synset, 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.
an androgenic compound contained in drugs that are used to treat testosterone deficiency and female breast cancer and to stimulate growth and weight gain
Synonyms, antonyms and the broader and narrower relations for methyltestosterone come from Princeton University’s WordNet. Full sources and licences.