The best replacement for rehearsal is practice.

The best alternatives to rehearsal are rated as following:
★★★★★  practice
★★★  rehearsal
★★  elaborative rehearsal
★★  maintenance rehearsal
★  elaborative
★  maintenance
★  rote
  rehearsals
  rote rehearsal

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Speaking about rehearsal, one probably shouldn't forget about memory.

Other search terms related to rehearsal and their ratings are:
★★★★★ memory
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