launch vs impel

launch is a noun but impel is not a noun.

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

As verbs, impel is a hypernym of launch; that is, impel is a word with a broader meaning than launch:

Other hypernyms of launch include propel.

launch (noun)	impel (noun)
the act of propelling with force
a motorboat with an open deck or a half deck

launch (verb)	impel (verb)
begin with vigor	cause to move forward with force
propel with force	urge or force (a person) to an action; constrain or motivate
launch for the first time; launch on a maiden voyage
get going; give impetus to
smoothen the surface of
set up or found