Something learned:
* Learned (past tense of "learn") - This is the most common homophone, and it is often used in the context of acquiring knowledge.
* Earned (past tense of "earn") - This implies something was gained through effort or work.
* Burned (past tense of "burn") - This has a more literal meaning but can be used metaphorically to refer to a painful or difficult lesson learned.
To reduce:
* Re-duce (to lessen or decrease something) - This is the most common homophone.
* Re-use (to use something again) - This implies a focus on sustainability and preventing waste.
It's important to consider the context to determine the appropriate homophone.