summon vs vouch

summon and vouch both are verbs.

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

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

Other hyponyms of summon include demand.

summon (verb)	vouch (verb)
make ready for action or use	give supporting evidence
call in an official matter, such as to attend court	summon (a vouchee) into court to warrant or defend a title
ask to come	give personal assurance; guarantee
gather or bring together	give surety or assume responsibility
cause to become available for use, either literally or figuratively