The word(s) "lesson" appears 168 time(s) in 166 verse(s) in Quran in Mohsin Khan translation.

(151) And among His Ayat (proofs, evidence, lessons, signs, etc.) is the creation of the heavens and the earth, and whatever moving (living) creatures He has dispersed in them both. And He is All-Potent over their assembling (i.e. resurrecting them on the Day of Resurrection after their death, and dispersion of their bodies) whenever He wills.

(152) And indeed We did send Musa (Moses) with Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) to Fir'aun (Pharaoh) and his chiefs (inviting them to Allah's religion of Islam) He said: "Verily, I am a Messenger of the Lord of the 'Alamin (mankind, jinn and all that exists)."

(153) But when he came to them with Our Ayat (proofs, evidence, verses, lessons, signs, revelations) behold, they laughed at them.

(154) And We made them a precedent (as a lesson for those coming after them), and an example to later generations.

(155) (You) who believed in Our Ayat (proofs, verses, lessons, signs, revelations, etc.) and were Muslims (i.e. who submit totally to Allah's Will, and believe in the Oneness of Allah - Islamic Monotheism).

(156) These are the Ayat (proofs, evidence, verses, lessons, revelations, etc.) of Allah, which We recite to you (O Muhammad صلى الله عليه و سلم) with truth. Then in which speech after Allah and His Ayat will they believe?

(157) This (Qur'an) is a guidance. And those who disbelieve in the Ayat (proofs, evidence, verses, lessons, signs, revelations) of their Lord, for them there is a painful torment of Rijz (a severe kind of punishment).

(158) And indeed We have destroyed towns (populations) round about you, and We have (repeatedly) shown (them) the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) in various ways that they might return (to the truth and believe in the Oneness of Allah - Islamic Monotheism).

(159) It is He Who sends down manifest Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) to His slave (Muhammad صلى الله عليه وسلم) that He may bring you out from darkness into light. And verily, Allah is to you full of kindness, Most Merciful.

(160) Know that Allah gives life to the earth after its death! Indeed We have made clear the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) to you, if you but understand.