summon vs invoke

summon and invoke both are verbs.

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

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

Other hyponyms of summon include arouse, bring up, call down, call forth, conjure, conjure up, evoke, put forward, raise, stir.

summon (verb)	invoke (verb)
make ready for action or use	cite as an authority; resort to
call in an official matter, such as to attend court	request earnestly (something from somebody); ask for aid or protection
ask to come	summon into action or bring into existence, often as if by magic
gather or bring together
cause to become available for use, either literally or figuratively