To laugh at someone in German is:
Jemanden auslachen
Über jemanden lachen
Yes, the word 'laugher' is a noun, word for someone who laughs often or is laughing; a word for a person.
someone - jemand
laughing = 'aka'aka
Laughing has two syllables.
It's wrong to laugh at someone who is unhappy or distraught. There's a difference to laughing WITH someone and laughing AT someone. Laughing WITH someone is usually lighthearted fun, and nobody gets hurt. Laughing AT someone is considered rude or mean, because the person being laughed at is usually in an unhappy situation.
Depends on how it is used. As in Santa Claus laughing (Ho! Ho! Ho!) not a bad word. But calling someone a ho as an insulting name is a bad word.
Someone who is "mischievous" is said to be "bösartig", "spitzbübisch", "boshaft" or "schadenfroh" in German.
Mit jemand ausgehen=I am dating someone.
Schadenfreude.
Because laughing at someone is considered unethical one needs to be disciplined.
The Luhya translation of the English word 'Laughing' is "Okhutsekha".
In the term, "laughing boy", the word "laughing" is an adjective describing the noun"boy".