Angels - F

Faith = Faith is an important virtue within the Order of Archangels and your standing within it will be directly related to how loyal and stalwart you behave. Fools and traitors have no place within the Archangel Order. 
Fallen = Among Celestials, the term 'Fallen' denotes the Fallen Angels, although among non-Celestial Adepts it simply means the Order of Fallen.
Fallen Angels = Rebel Angels who now reside in Hell and seek to exact their rage and fury against anyone they can. For more info see Fallen Angels. 
Fereons = Warrior Angels who attack with flaming armor and weapons. 
Fire Born = Euphemism for Celestials. 
Fire Speakers = These Angel literally speak flames - their very words are conjurations of heat and flame. Mortals cannot hear them for to do so would be to have one's eardrums burned out from within their skulls. Flame Speakers reside in the higher sections of Heaven and rarely if ever come down to Earth. 
First War = The First War In Heaven was fought between the Loyalist and Fallen Angels. Michael was charged by God Himself with leading the Loyalist forces, while Lucifer was the champion of the Fallen. The war ended in a victory for the Light, with the Fallen Angels being driven from Heaven and into Hell.
Followers of Light = The Followers of Light Chapter is said to have been created by the Archangel Michael who sought to organize lesser beings to fight alongside the Angels against the Darkness. That would make the FoL the first among all the Adept Chapters. For more info see Followers of Light.
Order of the Flame = Elite division of Celestials who deal with dire threats on Earth.