Synonyms for Mum (same or very similar meaning)
WordNet sense 1 (of China):
florist's chrysanthemum, Chrysanthemum morifolium, Dendranthema grandifloruom, florists' chrysanthemumWordNet sense 2 (informal terms for a mother):
ma, mama, mamma, mom, momma, mommy, mummyWordNet sense 3 (failing to speak or communicate etc when expected to):
silentWordNet sense 4 (not inclined to talk or give information or express opinions):
uncommunicative, incommunicativeFrom the ODE community, based on WordNetadd/edit