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

(101) But those who strive against Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.), to frustrate them, they will be dwellers of the Hell-fire.

(102) And verily in the cattle there is indeed a lesson for you. We give you to drink (milk) of that which is in their bellies. And there are, in them, numerous (other) benefits for you, and of them you eat.

(103) Verily, in this [what We did as regards drowning of the people of Nuh (Noah)], there are indeed Ayat (proofs, evidence, lessons, signs, etc. for men to understand), for sure We are ever putting (men) to the test.

(104) Then We sent Our Messengers in succession. Every time there came to a nation their Messenger, they denied him; so We made them follow one another (to destruction), and We made them as Ahadith (the true stories for mankind to learn a lesson from them). So away with a people who believe not!

(105) Then We sent Musa (Moses) and his brother Harun‎‎ (Aaron), with Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) and manifest authority,

(106) And those who believe in the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) of their Lord;

(107) (This is) a Surah (chapter of the Qur'an) which We have sent down and which We have enjoined, (ordained its laws); and in it We have revealed manifest Ayat (proofs, evidence, verses, lessons, signs, revelations - lawful and unlawful things, and set boundaries of Islamic Religion), that you may remember.

(108) And Allah makes the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) plain to you, and Allah is All-Knowing, All-Wise.

(109) And indeed We have sent down for you Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) that make things plain, and the example of those who passed away before you, and an admonition for those who are Al-Muttaqun (the pious - See V.2:2).

(110) Allah causes the night and the day to succeed each other (i.e. if the day is gone, the night comes, and if the night is gone, the day comes, and so on). Truly, in this is indeed a lesson for those who have insight.