General meaning (a means of conveying something):
* Channel
* Medium
* Means
* Passage
* Path
* Route
* Vehicle
For a physical pipe or tube:
* Pipe
* Tube
* Duct
* Tunnel
* Hose
* Line
For an abstract concept:
* Agent
* Instrument
* Mechanism
* Tool
For a person or group facilitating communication:
* Mediator
* Intermediary
* Go-between
* Facilitator
To choose the best alternative, consider:
* What is being conveyed? (Electricity, water, information, etc.)
* Is it physical or abstract?
* Is it a person, thing, or concept?
For example, if you're talking about a pipe carrying water, "pipe" is a more specific and accurate term than "conduit." If you're talking about a person who facilitates communication, "mediator" might be a better choice than "conduit."