For a bicycle:
* சைக்கிள் (saikil) - This is the most common and direct translation.
* வண்டி (vandi) - This means "vehicle" and can be used for bicycles, motorcycles, and other vehicles.
For a cycle as a process or a period:
* சுழற்சி (suzharchi) - This means "cycle" in the sense of a recurring process.
* நிலை (nilai) - This means "stage" or "phase" and can be used to refer to a specific stage in a cycle.
* பருவம் (paruvam) - This means "season" and can be used to refer to a cycle of seasons.
For a cycle as a machine:
* சைக்கிள் (saikil) - This is the most common and direct translation.
* சுழல் இயந்திரம் (suzal iyanthira) - This means "rotating machine" and could be used for a machine that cycles.
The best word to use will depend on the context of your sentence.