6 letters · 8 points in Scrabble
noun a person who smiles
noun the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British)
originThe singer was born Destiny Hope Cyrus but nicknamed Smiley (later Miley) by her parents because she often smiled as a baby; hence smile + -er.
Etymology from Wiktionary, CC BY-SA 3.0