impel vs catapult

impel is not a noun while catapult is a noun.

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

As verbs, catapult is a hyponym of impel; that is, catapult is a word with a more specific, narrower meaning than impel:

Other hyponyms of impel include flip, rocket, carry, kick, pole, punt, hit, throw, drive, launch, project, send off, loft.

impel (noun)	catapult (noun)
	an engine that provided medieval artillery used during sieges; a heavy war engine for hurling large stones and other missiles
	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

impel (verb)	catapult (verb)
cause to move forward with force	shoot forth or launch, as if from a catapult
urge or force (a person) to an action; constrain or motivate	hurl as if with a sling