The word(s) "disbeliever" appears 377 time(s) in 355 verse(s) in Quran in Mohsin Khan translation.

(141) And when We change a Verse (of the Qur'an,) in place of another - and Allah knows best what He sends down - they (the disbelievers) say: "You (O Muhammad صلى الله عليه و سلم) are but a Muftari! (forger, liar)." Nay, but most of them know not.

(142) Verily, Ibrahim (Abraham) was an Ummah (a leader having all the good righteous qualities), or a nation, obedient to Allah, Hanif (i.e. to worship none but Allah), and he was not one of those who were Al-Mushrikun (polytheists, idolaters, disbelievers in the Oneness of Allah, and those who joined partners with Allah).

(143) Then, We have sent the revelation to you (O Muhammad صلى الله عليه و سلم saying): "Follow the religion of Ibrahim (Abraham) Hanif (Islamic Monotheism - to worship none but Allah) and he was not of the Mushrikun (polytheists, idolaters and disbelievers).

(144) [And We said in the Taurat (Torah)]: "It may be that your Lord may show mercy unto you, but if you return (to sins), We shall return (to Our Punishment). And We have made Hell a prison for the disbelievers.

(145) And surely, We have explained [Our Promises, Warnings and (set forth many) examples] in this Qur'an that they (the disbelievers) may take heed, but it increases them in naught save aversion.

(146) And when We bestow Our Grace on man (the disbeliever), he turns away and becomes arrogant (far away from the Right Path). And when evil touches him, he is in great despair.

(147) Say (to the disbelievers): "If you possessed the treasure of the Mercy of my Lord (wealth, money, provision.), then you would surely hold back (from spending) for fear of (being exhausted), and man is ever miserly!"

(148) (He has made it) straight to give warning (to the disbelievers) of a severe punishment from Him, and to give glad tidings to the believers (in the Oneness of Allah - Islamic Monotheism), who do righteous deeds, that they shall have a fair reward (i.e. Paradise).

(149) And thus We made their case known (to the people), that they might know that the Promise of Allah is true, and that there can be no doubt about the Hour. (Remember) when they (the people of the city) disputed among themselves about their case, they said: "Construct a building over them; their Lord knows best about them;" (then) those who won their point said (most probably the disbelievers): "We verily shall build a place of worship over them."

(150) And say: "The truth is from your Lord." Then whosoever wills, let him believe; and whosoever wills, let him disbelieve. Verily, We have prepared for the Zalimun (polytheists and wrong-doers.), a Fire whose walls will be surrounding them (disbelievers in the Oneness of Allah). And if they ask for help (relief, water), they will be granted water like boiling oil, that will scald their faces. Terrible is the drink, and an evil Murtafaq (dwelling, resting place.)!