IPA: /ˈsmaɪlər/
KK: /ˈsmaɪlər/
A person who has a friendly or cheerful expression, often showing happiness by smiling.
She is known as a smiler because she always greets everyone with a smile.
Smiler → It is formed from "smile" (from Old English *smilan*, meaning to smile) and "-er" (meaning a person who). A smiler is a person who smiles.
Think of someone who is 'smiling' — the '-er' just means a person. A smiler is someone who smiles.