No, 'a rib' is not a palindrome because it is not spelled the same way forward and backward.
Level.
level
level
LEVEL
eye
eye
The palindrome is Eye.
A palindrome for a rotating engine part is Rotor.
A palindrome for a part of a motor that turns or rotates is a rotor.
"Level" is a palindrome meaning "no part higher than the other."
The word rotor is used to refer to a rotating part of a machine. It is also a palindrome.
eye
rotator
rotor
level
poop (deck)