How Does Your Brain Remember and Retrieve Words?

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Across
  1. 4. Someone who does research
  2. 5. When there is a word you want to say but you can't think of it, it is on the tip of your...
  3. 6. Organ of the body where you think
Down
  1. 1. A collection of words
  2. 2. A book with a lot of words and their meanings
  3. 3. Adjective meaning relating to the brain