The best replacement for transpiration is evaporation.

The best alternatives to transpiration are rated as following:
★★★★★  evaporation
★★★  translocation
★★★  respiration
★  guttation
★  perspiration
★  evapotranspiration

Your alternative for transpiration is not listed? Suggest!
Speaking about transpiration, one probably shouldn't forget about plants.

Other search terms related to transpiration and their ratings are:
★★★★★ plants
You have in mind a companion for transpiration and it is not yet here? Propose!



Google Trends

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transpiration
evaporation
translocation