invoke vs call on

invoke and call on both are verbs.

Word	Noun	Adjective	Verb	Adverb
invoke	No	No	Yes	No
call on	No	No	Yes	No

As verbs, call on is a hyponym of invoke; that is, call on is a word with a more specific, narrower meaning than invoke:

invoke: request earnestly (something from somebody); ask for aid or protection
call on: have recourse to or make an appeal or request for help or information to

Other hyponyms of invoke include plead, turn.

invoke (verb)	call on (verb)
cite as an authority; resort to	have recourse to or make an appeal or request for help or information to
request earnestly (something from somebody); ask for aid or protection	to visit someone, usually for a short time
summon into action or bring into existence, often as if by magic