Main Entry:grinPart of Speech:noun, verbDefinition:smile widelySynonyms:beam, crack, simper, smirkAntonyms:frown, growl
Main Entry:smilePart of Speech:verbDefinition:put on a happy expressionSynonyms:be gracious, beam, express friendliness, express tenderness, grin, laugh, look amused, look delighted, look happy, look pleased, simper, smirkAntonyms:frown, glower
Grin or smirk
smile, smirk
SMILE
GRIN
grin
Grin
smile
beam grin
A GRIN is a big smile.
Grin http://www.synonym.com/synonyms/smile/
grin,
depends on the mood of the person if they are smiling. If they are planning something bad, smirk would be a good word. Also, grin would be another good word to use intead of smile.