The best replacement for dendrites is axons.

The best alternatives to dendrites are rated as following:
★★★★★  axons
★★★  soma of another axon
★  tin whiskers
★  axon terminals
★  pseudodendrites
  axon

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Speaking about dendrites, one probably shouldn't forget about neurons.

Other search terms related to dendrites and their ratings are:
★★★★★ neurons
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dendrites
axons
soma of another axon