different between clammer vs crammer

English

clam +? -er

clammer (plural clammers)

cram +? -er

crammer (plural crammers)

One who crams or stuffs.
- 1959, A.M.A. Archives of Pathology (volume 68)
  The pigeon crammers of Paris took mouthfuls of grain and water and spat it into the mouth of a pigeon.
A book used for accelerated study in preparation for an examination.
A student who studies hard for an examination.
A teacher who aids such a student.
A school whose speciality is helping students to pass certain examinations.
(dated, British slang) A liar.
(dated, British slang) A lie.
- 1939 Frank Richards, The Magnet, Loder Looks for Trouble.
  I'm afraid he wouldn't mind telling crammers about it if he was questioned.

(lie; liar; one who helps others to pass examinations): 1873, John Camden Hotten, The Slang Dictionary

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