different between hypergelast vs agelast

English

From Ancient Greek ???? (hupér, “over”) + ???????? (gelast?s, “laugher”), from ????? (gelá?, “I laugh”).

hypergelast (plural hypergelasts)

someone who laughs excessively.
- 1992, Henry Jenkins, What Made Pistachio Nuts? (Columbia University Press)
  America had become a laughing nation, a country of frivolists and hypergelasts, a culture dangerously out of control.
Synonym: cachinnator
Antonym: agelast

Borrowing from Ancient Greek ????????? (agélastos, “not laughing”), from ????? (gelá?, “to laugh”).

agelast (plural agelasts)

(rare) one who never laughs (especially at jokes); a mirthless person
Antonym: cachinnator, hypergelast

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