A blaze is a bright, strong flame. A raging fire is blazing and you can also say other types of shining, like with talent, are types of blazing. A fire is a blaze. Fire, when it's going strong and burning bright, is blazing.
From Middle English blase, from Old English blse, blase ( firebrand, torch, lamp, flame ), from Proto-West Germanic *blas, from Proto-Germanic *blas ( torch ), from Proto-Indo-European *bel- ( to shine, be white ).