Is it necessary to verify the presence of a specific word in the Noble Qur’an if one is unsure of it?

For a person to be keen on studying the Qur'an, contemplating it, reciting it, and pondering its meanings is desirable, as Allah the Almighty said: "And recite what has been revealed to you from the Book of your Lord. No one can alter His words, and you will find no refuge besides Him" (Al-Kahf: 27), and He said: "Do they not then ponder about the Qur'an? Had it been from other than Allah, they would surely have found in it much discrepancy" (An-Nisa: 82). One is not obligated to learn the entire Qur'an, except for Al-Fatiha. It is preferable for a Muslim to maintain a continuous connection with the Qur'an and to complete its recitation regularly, understanding its meanings.