The best replacement for passive transport is active transport.

The best alternatives to passive transport are rated as following:

★★★★★	active transport
★★★	diffusion
★★	facilitated diffusion
★	facilitated transport
★	osmosis
	passive diffusion
	active

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Speaking about passive transport, one probably shouldn't forget about carrier protein.

Other search terms related to passive transport and their ratings are:

★★★★★	carrier protein
★★★	active transport

You have in mind a companion for passive transport and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of passive transport in all years. Click on graph for more.

passive transport

active transport

diffusion