impeller

nouns

the blade of a rotor (as in the compressor of a jet engine)
impeller
is derived from
impel
is a part of
rotating mechanism consisting of an assembly of rotating airfoils
"there are horizontal rotors on a helicopter or compressor rotors in a jet engine"
rotor
is a type of (narrower)
flat surface that rotates and pushes against air or water
blade, vane