invoke vs request

invoke is not a noun while request is a noun.

Word	Noun	Adjective	Verb	Adverb
invoke	No	No	Yes	No
request	Yes	No	Yes	No

As verbs, request is a hypernym of invoke; that is, request is a word with a broader meaning than invoke:

invoke: request earnestly (something from somebody); ask for aid or protection
request: express the need or desire for

Other hypernyms of invoke include ask for, bespeak, call for, quest.

invoke (noun)	request (noun)
	the verbal act of requesting
	a formal message requesting something that is submitted to an authority

invoke (verb)	request (verb)
cite as an authority; resort to	express the need or desire for
request earnestly (something from somebody); ask for aid or protection	ask (a person) to do something
summon into action or bring into existence, often as if by magic	inquire for (information)