The best replacement for coagulation is flocculation.

The best alternatives to coagulation are rated as following:
★★★★★  flocculation
★★★  agglutination
★★  clotting
★  thrombosis
★  denaturation
★  blood gulch
  platelet aggregation
  clot
  hemostasis

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Speaking about coagulation, one probably shouldn't forget about sedimentation.

Other search terms related to coagulation and their ratings are:
★★★★★ sedimentation
★★★★ sepsis
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Google Trends

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coagulation
flocculation
agglutination