summons vs vouch

summons is a noun but vouch is not a noun.

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

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

Other hyponyms of summons include demand.

summons (noun)	vouch (noun)
a writ issued by authority of law; usually compels the defendant's attendance in a civil suit; failure to appear results in a default judgment against the defendant
a request to be present
an order to appear in person at a given place and time

summons (verb)	vouch (verb)
call in an official matter, such as to attend court	give supporting evidence
	summon (a vouchee) into court to warrant or defend a title
	give personal assurance; guarantee
	give surety or assume responsibility