A: In the noble Quran a 'Zawjah' is a woman who has harmony, similarity and compatibility between her and her husband with out differing... If that is not acheived then she is called 'Mar'ah'..
Example of 'Zawjah' mentioned in the Quran:
وَمِنْ آَيَاتِهِ أَنْ خَلَقَ لَكُمْ مِنْ أَنْفُسِكُمْ أَزْوَاجًا لِتَسْكُنُوا إِلَيْهَا وَجَعَلَ بَيْنَكُمْ مَوَدَّةً وَرَحْمَةً إِنَّ فِي ذَلِكَ لَآَيَاتٍ لِقَوْمٍ يَتَفَكَّرُون
And of His signs is that He created for you from yourselves mates that you may find tranquility in them; and He placed between you affection and mercy. Indeed in that are signs for a people who give thought. [Ar-Rum:21]
وَقُلْنَا يَا آَدَمُ اسْكُنْ أَنْتَ وَزَوْجُكَ الْجَنَّةَ
And We said, "O Adam, dwell, you and your wife, in Paradise and eat therefrom in [ease and] abundance from wherever you will. But do not approach this tree, lest you be among the wrongdoers."
[Al-Baqarah:35]
Example of 'Mar'ah' mentioned in the Quran:
ضَرَبَ اللَّهُ مَثَلًا لِّلَّذِينَ كَفَرُوا اِمْرَأَةَ نُوحٍ وَاِمْرَأَةَ لُوطٍ كَانَتَا تَحْتَ عَبْدَيْنِ مِنْ عِبَادِنَا صَالِحَيْنِ فَخَانَتَاهُمَا
Allah presents an example of those who disbelieved: the wife of Noah and the wife of Lot. They were under two of Our righteous servants but betrayed them"
[At-Tahrim:10]
Q: Who is the Prophet that was swallowed by a fish/whale?