pusher vs thruster

pusher and thruster both are nouns.

Word	Noun	Adjective	Verb	Adverb
pusher	Yes	No	No	No
thruster	Yes	No	No	No

As nouns, pusher and thruster are synonyms defined as:

pusher (noun)	thruster (noun)
a small vehicle with four wheels in which a baby or child is pushed around	a small rocket engine that provides the thrust needed to maneuver a spacecraft
a sandal attached to the foot by a thong over the toes	one who intrudes or pushes himself forward
someone who pushes
an unlicensed dealer in illegal drugs
one who intrudes or pushes himself forward