invocation vs invoke

invocation is a noun but invoke is not a noun.

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

invocation (noun)	invoke (noun)
the act of appealing for help
calling up a spirit or devil
a prayer asking God's help as part of a religious service
an incantation used in conjuring or summoning a devil

invocation (verb)	invoke (verb)
	cite as an authority; resort to
	request earnestly (something from somebody); ask for aid or protection
	summon into action or bring into existence, often as if by magic