The best replacement for centrosome is centriole.

The best alternatives to centrosome are rated as following:
★★★★★  centriole
★★★  centromere
★★  mtoc
★  basal body
★  aster
  centrioles

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Speaking about centrosome, one probably shouldn't forget about centrioles.

Other search terms related to centrosome and their ratings are:
★★★★★ centrioles
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centrosome
centriole
centromere