The best replacement for angiosperm is gymnosperm.

The best alternatives to angiosperm are rated as following:
★★★★★  gymnosperm
★★★  gymnosperm life cycle
★★  gymnosperm difference
★★  conifer
  anthophyta
  gymnosperms

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Speaking about angiosperm, one probably shouldn't forget about gymnosperm.

Other search terms related to angiosperm and their ratings are:
★★★★★ gymnosperm
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