Synonyms for MAO (same or very similar meaning)
WordNet sense 1 (an enzyme that catalyzes the oxidation of many body compounds (e.g., epinephrine and norepinephrine and serotonin)):
monoamine oxidaseWordNet sense 2 (Chinese communist leader (1893-1976)):
Mao Tsetung, Mao ZedongFrom the ODE community, based on WordNetadd/edit