نَصْرُ

A word in the Arabic language will either be 1) a verb or 2) a noun or 3) a particle – نَصْرُ is a noun

A noun may either be 1) Definite or indefinite 2) Masculine or feminine 3) Singular, dual or plural 4) Nominative, accusative or genitive

النَّصْرُ is the natural state of a definite noun and it loses it’s definite article, becoming نَصْرُ due to it being a possessed noun

To assist, aid, help, succour, protect

Grammatical analysis of نَصْرُ
اسْمٌ مَرْفُوْعٌ بِالضَّمَّةِ الزَّاهِرَةِ وَهُوَ مُضَافٌ 
مَعْرِفَةٌمُفْرَدٌمُذَكَّرٌمَرْفُوْعٌن ص ربَاب نَصَرَنَصَرَ يَنْصُرُفَعْلٌاسْمٌالْمَصْدَرُ
DefiniteSingularMasculineNominativeRootthe Help ofنPatternNounVerbal noun
the aid of
the succor of
Surah/Below are the 5 verses in the holy Quran containing the possessed nounنَصْرُ
Verse
Or you think that you will enter paradise while not coming to youأَمْ حَسِبْتُمْ أَنْ تَدْخُلُوا الجَنَّةَ وَلَمَّا يَأْتِكُمْ
the like of those who passed away before you?مَثَلُ الَّذِيْنَ خَلَوْا مِنْ قَبْلِكُمْ
Adversity and hardship touched them and they were shaken untilمَّسَّتْهُمُ البَأْسَآءُ وَالضَّرَّآءُ وَزُلْزِلُوا حَتَّى
the prophet and those who believed with him said: “When, the help of Allah (SWT)يَقُوْلُ الرَّسُوْلُ وَالَّذِيْنَ ءَامَنُوا مَعَهُ مَتَى نَصْرُ اللهِ
2-214Now surely, certainly the Help of Allah (SWT) is nearأَلَآ إِنَّ نَصْرَ اللهِ قَرِيْبٌ
Verily, Messengers from before you were deniedوَلَقَدْ كُذِّبَتْ رُسُلٌ مِّنْ قَبْلِكَ
but they were patient over what they were rejectedفَصَبَرُوا عَلَى مَا كُذِّبُوا
and they were troubled (harmed) until came to them Our helpوَأُوْذُوا حَتَّى أَتَاهُمْ نَصْرُنَا
and no one can alter the words of Allah (SWT)وَلَا مُبَدِّلَ لِكَلِمَاتِ اللهِ
6-34and most certainly came to you of the news of the messengersوَلَقَدْ جَآءَكَ مِنْ نَّبَإِىْ الْمُرْسَلِيْنَ
12-110
30-47
110-1When the help of Allah (SWT) and the victory comesإِذَا جَاءَ نَصْرُ اللهِ وَ الْفَتْحُ