Strong's #922: bohuw (pronounced bo'-hoo)

from an unused root (meaning to be empty); a vacuity, i.e. (superficially) an undistinguishable ruin:--emptiness, void.

Brown-Driver-Briggs Hebrew Lexicon:

ּּ

bôhû

1) emptiness, void, waste

Part of Speech: noun masculine

Relation: from an unused root (meaning to be empty)

Usage:

This word is used 3 times:

 

Genesis 1:2: "And the earth was without form, and void; and darkness was upon the face of the deep."
Isaiah 34:11: "it the line of confusion, and the stones of emptiness."
Jeremiah 4:23: "the earth, it was without form, and void; and the heavens, and they had no light."