mum

(noun) of China. Synonyms: florist's chrysanthemum, florists' chrysanthemum, Dendranthema grandifloruom, Chrysanthemum morifolium.

(noun) informal terms for a mother. Synonyms: ma, mama, mamma, mom, momma, mommy, mammy, mummy.

(noun) secrecy. Example: "Mum's the word."

(adj) failing to speak or communicate etc when expected to. Synonyms: silent. Example: "The witness remained silent."