The best replacement for vertex is agility.

The best alternatives to vertex are rated as following:
★★★★★  agility
★★★★  vertices
★★★  apex
★★★  breech
★★★  cephalic presentation
★★  icom
★★  edge
★★  angle
★★  cephalic
★★  vertex
★  taxware
★  agility 2
★  auxo 2
★  x25 m
★  lightmap
★  wiseco
  velociraptor
  sabrix
  agility 3
  vertex turbo
  k9 super fuel
  thule apex
  octopus
  weisco

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Speaking about vertex, one probably shouldn't forget about graphing.

Other search terms related to vertex and their ratings are:
★★★★★ graphing
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vertex
agility
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