However, "lesson" is a near homonym for "lessen." While it is spelled differently, it sounds very similar and can be easily confused in spoken language.
Here's the breakdown:
* Lessen: To make something smaller or less intense.
* Lesson: Something that is learned, usually from instruction or experience.
If you're looking for a word that is truly a homonym for "lessen," you'll need to look for a word that sounds exactly the same but has a different meaning. Unfortunately, no such word exists.