rotor, rotator
A palindromic word for a device that revolves could be "rotor." It reads the same forwards and backwards.
rotor
radar
rotator
RADAR
radar
radar
radar
radar
rotor, rotator
A palindrome is a word or phrase that can be read the same right to left or left to right. In this case, the answer would be "radar."
Alliteration is a literary device where the initial consonant sounds are repeated in close proximity in a phrase or sentence. It is not an onomatopoeia, cognate, palindrome, or eponym.