plight vs vouch

plight is a noun but vouch is not a noun.

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

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

Other hyponyms of plight include vow, guarantee, covenant, covenant.

plight (noun)	vouch (noun)
a solemn pledge of fidelity
a situation from which extrication is difficult especially an unpleasant or trying one

plight (verb)	vouch (verb)
promise solemnly and formally	give supporting evidence
give to in marriage	summon (a vouchee) into court to warrant or defend a title
	give personal assurance; guarantee
	give surety or assume responsibility