Strong's #4442: pur (pronounced poor)
 a primary word; "fire" (literally or figuratively, specially, lightning):--fiery, fire.
Thayer's Greek Lexicon:
 ͂ 
 
  pur 
 
 1) fire
 
  Part of Speech: noun neuter
Relation: a root word
  Citing in TDNT: 6:928, 975
 
Usage:
This word is used 74 times:
Revelation 2:18: "eyes like unto a flame  of fire, and his feet are like"
Revelation 3:18: "gold tried in  the fire, that thou mayest be rich; and white"
Revelation 4:5: "and there were seven lamps  of fire burning before the throne,"
Revelation 8:5: "filled it with  fire of the altar, and cast"
Revelation 8:7: "there followed hail and  fire mingled with blood, and they were cast"
Revelation 8:8: "a great mountain burning  with fire was cast into the sea:"
Revelation 9:17: "their mouths issued  fire and smoke and brimstone."
Revelation 9:18: "killed, by the  fire, and by the smoke,"
Revelation 10:1: "feet as pillars  of fire:"
Revelation 11:5: "will hurt them,  fire proceedeth out of their mouth,"
Revelation 13:13: "so that he maketh  fire come down from heaven on"
Revelation 14:10: "and he shall be tormented with  fire and brimstone in the presence of the"
Revelation 14:18: "which had power over  fire; and cried with a loud cry"
Revelation 15:2: "a sea of glass mingled  with fire: and them that had gotten the victory over the"
Revelation 16:8: "to scorch men with  fire."
Revelation 17:16: "burn her with  fire."
Revelation 18:8: "famine; and she shall be utterly burned with  fire: for strong is the Lord"
Revelation 19:12: "eyes were as a flame  of fire, and on his head"
Revelation 19:20: "alive into a lake  of fire burning with brimstone."
Revelation 20:9: "compassed the camp of the saints about, and the beloved city: and  fire"
Revelation 20:10: "into the lake  of fire and brimstone, where the"
Revelation 20:14: "into the lake  of fire. This is the second"
Revelation 20:15: "into the lake  of fire."
Revelation 21:8: "the lake which burneth  with fire and brimstone: which is the second"