'Word' in the Bible

We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts:

For this they willingly are ignorant of, that by the word of God the heavens were of old, and the earth standing out of the water and in the water:

But the heavens and the earth, which are now, by the same word are kept in store, reserved unto fire against the day of judgment and perdition of ungodly men.