Was Iblees An Angel?
Ghamidi Sahab has discussed the etymology of word Jinn in classic Arabic in the following video and these two words have a clear distinction in Classic Arabic: Discussion 1123 • Reply 1126 Also, Quran makes a clear distinction as pointed out by sister above: وَإِذْ قُلْنَا لِلْمَلَائِكَةِ اسْجُدُوا لِآدَمَ فَسَجَدُوْا إِلَّا إِبْلِيسَ كَانَ مِنَ الْجِنِّ فَفَسَقَ عَنْ أَمْرِ رَبِّهِ أَفَتَتَّخِذُوْنَهُ وَذُرِّيَّتَهُ أَوْلِيَآءَ مِنْ دُونِیْ وَهُمْ لَكُمْ عَدُوٌّ بِئْسَ لِلظَّالِمِيْنَ بَدَلًا. مَا أَشْهَدْتُهُمْ خَلْقَ السَّمَاوَاتِ وَالْأَرْضِ وَلَا خَلْقَ أَنْفُسِهِمْ وَمَا كُنْتُ مُتَّخِذَ الْمُضِلِّيْنَ عَضُدًا. Remember when We directed the angels: “Prostrate before Adam.” They prostrated except Iblis. He was among the jinn. So, he evaded the directive of his Lord. Now, leaving Me, are you making him and his progeny as your guardian, even though they are your open enemy? What an evil substitute these wrongdoers are adopting! [They are making them My associates whereas], I called none of these [devils] at the time of creating the heavens and the earth nor at the time of their own creation. I am not One Who makes those who lead astray as My helpers . ( 18:50-51 )
Please see this as well: Discussion 35995 • Reply 36104