smiler
smi·ler
noun
1.
a person who smiles
Origin
The singer was born Destiny Hope Cyrus but nicknamed Smiley (later Miley) by her parents because she often smiled as a baby; hence smile + -er.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.