thruster vs pusher

thruster and pusher both are nouns.

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

As nouns, thruster and pusher are synonyms defined as:

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