[Gehenna]
Gehenna is one word used for Hell. It comes from the Hebrew Gey-Hinnom, literally "valley of Hinnom." This word originated as the name for a place south of the old city of Jerusalem where the city's rubbish was burned. At one time, live babies were thrown crying into the fire under the arms of the idol, Moloch, to die there. This place was so despised by the people after the righteous King Josiah abolished this hideous practice that it was made into a garbage heap. Bodies of diseased animals and executed criminals were thrown there and burned.
[gittith]
Gittith is a musical term possibly meaning "an instrument of Gath."
[goad]
a sharp, pointed prodding device used to motivate reluctant animals (such as oxen and mules) to move in the right direction.
[gospel]
Gospel means "good news" or "glad tidings," specifically the Good News of Jesus' life, death, and resurrection for our salvation, healing, and provision; and the hope of eternal life that Jesus made available to us by God's grace.
[Hades]
Hades: The nether realm of the disembodied spirits.