All 5 Uses

serpent
in
Ender's Game
(Edited)

The small rug before the fire unraveled itself into a long, slender serpent with wicked teeth.
p. 78.8

serpent = snake
The serpent is a long thread; I can let myself down from the tower and find my way through that place.
p. 79.1
Tearing the snakes frantically from itself, the figure collapsed and died in a writhing heap of small serpents.
p. 109.7

serpents = snakes
What difference does it make that when the little serpents killed me in the game, I agreed with them, and was glad.
p. 110.9 *
As always the serpent waited in the tower room, unraveling itself from the rug on the floor.
p. 133.7

serpent = snake

Definitions:

(1) (serpent)
a snake
(2) (meaning too rare to warrant focus)
For less common senses of "serpent", see a comprehensive dictionary.