The Collaborative International Dictionary of English v.0.48:
Smiler \Smil"er\, n. One who smiles. --Tennyson. [1913 Webster]WordNet (r) 3.0 (2006):
smiler n 1: a person who smiles 2: the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British) [syn: countenance, physiognomy, phiz, visage, kisser, smiler, mug]