different between cookroom vs bookroom

English

cook +? room

cookroom (plural cookrooms)

A kitchen or room for cookery.
The galley or caboose of a ship.
- c. 1611, Walter Raleigh, Observations on the Navy and Sea Service
  in all their Ships (for the most Part) the Cook-rooms are built in their Forecastles, contrary to that which hath been anciently used.

book +? room

bookroom (plural bookrooms)

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