invocation vs petition

invocation and petition both are nouns.

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

As nouns, petition is a hypernym of invocation; that is, petition is a word with a broader meaning than invocation:

Other hypernyms of invocation include orison, prayer.

invocation (noun)	petition (noun)
the act of appealing for help	a formal message requesting something that is submitted to an authority
calling up a spirit or devil	reverent petition to a deity
a prayer asking God's help as part of a religious service
an incantation used in conjuring or summoning a devil

invocation (verb)	petition (verb)
	write a petition for something to somebody; request formally and in writing