core, corps, corpse

Core or core means the center of something, as the seed part of some fruits--
She cooked the apple without removing the core.
Core may mean the center of the Earth, or some other physical body--
There is molten metal in the earth's core.
Core may be used in a figurative sense--
Good behavior is at the core of their belief system.
Core may also be a verb ( action word ) --
Core and peel the apple, then slice it.
The grocer will core the pineapple for you.

Corps or corps ( rhymes with core ) means a group of people united for a purpose, usually military--
He joined the Marine Corps when he turned 18.
They trained until they became a fighting corps.

Corpse or corpse means a dead body--
The coroner came to examine the corpse.
Murder mysteries often begin with the detective finding a corpse.

Now that you know that, you can say--
"The dog from the canine corps helped them follow the pieces of apple core that led to the victim's corpse."

Note--the plural ( more than one ) form of "core" is "cores" ( corze )--
There are two apple cores on the floor.
Not to be confused with "course", meaning way or path--
Of course I didn't eat the apple cores. I threw them away.
Not to be confused with "coarse", meaning crude or rough--
That linen is very coarse. It won't make a comfortable shirt.

Note #2--the plural of "corps" remains "corps"--
There were only two fighting corps left.

Note #3--the plural of "corpse" is "corpses"--
There are two corpses in the drawing room. The police are on the way.