These words are pronounced exactly the same way.

We have the word lesson which is a period of teaching 

and lesson meaning to diminish

So to say these words correctly  we have two beats: le sun lesson

Now I do have written here i'm going to teach this  as sun. I think it's easy to remember because we  

see the sun in the sky; however, you can pronounce  it as sin or sen. The key is for that second  

syllable is, the second syllable is unstressed  so that vowel must be very short and unstressed.

All right so let's start with the le syllable. To  do this touch the tip of your tongue to the back  

of your top front teeth and then you're going to  pull it down. Mouth is going to continue to stay  

open and then you're going to see the tip of your  tongue between your top and your bottom teeth.

Next you're going to move to the sun  and to do this tip of the tongue is  

either pointed down or just behind the  top front teeth air continues to move  

out of your mouth. Add the short  uh just a super relaxed mouth.  

And then end with the n by touching the tip of  the tongue to the back of the top front teeth.

Let's put that together:

lesson lessen lesson  

lessen lesson lessen

And now for a sentence:

She drank extra coffee to lessen  her fatigue during the long lesson.

Give it a try I know people are going  to notice the difference. If you found  

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Thanks everyone have a great week!