IPA: /ˈweɪlər/
KK: /ˈweɪlər/
A person who cries out loudly, often in grief or sorrow.
The wailer at the funeral expressed deep sadness for the loss.
Wailer → The word is formed from "wail" (of uncertain origin, but possibly related to Old English *wailian*, meaning to cry out or lament) and the suffix "-er" (meaning a person who performs an action). A wailer is therefore a person who cries out or laments.
Think of someone who is 'crying out' — that's what a wailer does, as the root 'wail' relates to expressing sorrow.