The best replacement for fantastic is fantastical.

The best alternatives to fantastic are rated as following:
★★★★★  fantastical
★★★★  409
★★★  plastic man
★★  pacman
★  mr wizard
★  phantastic
★  formula 409
★  wonderful
  drastic
  magical realism
  elongated man

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Other search terms related to fantastic and their ratings are:
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Google Trends

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fantastic
fantastical
409