launcher vs catapult

launcher and catapult both are nouns.

Word	Noun	Adjective	Verb	Adverb
launcher	Yes	No	No	No
catapult	Yes	No	Yes	No

As nouns, launcher and catapult are synonyms defined as:

launcher (noun)	catapult (noun)
armament in the form of a device capable of launching a rocket	an engine that provided medieval artillery used during sieges; a heavy war engine for hurling large stones and other missiles
a device that launches aircraft from a warship	a plaything consisting of a Y-shaped stick with elastic between the arms; used to propel small stones
	a device that launches aircraft from a warship

launcher (verb)	catapult (verb)
	shoot forth or launch, as if from a catapult
	hurl as if with a sling