الْجَحِيْمَ

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

الْجَحِيْمُ is the natural state of this definite noun and it changes to الْجَحِيْمَ due to it being the: 1) المَفْعُوْلُ بِهِ object of a verb or 2) اسْمُ of إِنَّ or 3) خَبَرُ of كَانَ or 4) المَفْعُوْلُ فِيْهِ adverb of time or place or 5) المَفْعُوْلُ لَهُ noun that gives the reason for doing a thing or 6) المَفْعُوْلُ مَعَهُ noun that comes after the و which means “along with” or 7) المَفْعُوْلُ المُطْلَقُ is the مَصْدَرٌ of the verb occurring in the sentence or 8) الحَالُ adverb of manner or 9) التَّمْيِيْزُ noun that specifies the meaning of a vague word or 10) المُسْتَثْنَى noun that comes after إِلَّا meaning “except” or 11) المُنَادَى noun of calling or 12) it’s a noun of dependent declension a) نَعْتٌ / صِفَطٌ adjectives b) التَّوْكِيْدُ emphatic c) المَعْطُوْفٌ conjunction d) البَدَلُ synonym

Gehenna, ardent fire, flaming fire, blazing fire, intense fire, fiercely burning fire, intensely hot (place), place of punishment which is dark and waterless and which makes the faces of its inmates ugly and contracted, one of the names of hell

To light and stir up (the fire), open (the eyes)

مَعْرِفَةٌمُفْرَدٌمُؤَنَّثٌمَنْصُوْبٌج ح مبَاب فَتَحَفَعِيْلٌجَحَمَ يَجْحَمُاسْمٌاِسْمُ الْمُبَالَغَةِ
DefiniteSingularFeminineAccusativeRootThe HellfirePatternفNounNoun of intensity 
اسْمٌ فَاعِلٌ
Active participle
Surah/Below are the 3 verses in the holy Quran containing the definite, accusative nounالْجَحِيْمَ
Verse
69-31
79-39then truly hellfire, it is the abodeفَإِنَّ الجَحِيْمَ هِيَ المَأْوَى
102-6You will certainly see the hellfireلَتَرَوُنَّ الْجَحِيْمَ