Synonyms and related words :
beam, bridle, bright smile, broad grin, crack a smile, ear-to-ear grin, fleer, gleaming smile, glowing smile, grimace, grin, grinning, idiotic grin, leer, mince, mince it, prink, sardonic grin, scornful laugh, simper, smile, smile brightly, smiling, sneer, snicker, snigger, snort, stupid grin, toothful grin