vanish vs diminish

vanish and diminish both are verbs.

Word	Noun	Adjective	Verb	Adverb
vanish	No	No	Yes	No
diminish	No	No	Yes	No

As verbs, diminish is a hypernym of vanish; that is, diminish is a word with a broader meaning than vanish:

Other hypernyms of vanish include decrease, fall, lessen.

vanish (verb)	diminish (verb)
get lost, as without warning or explanation	decrease in size, extent, or range
decrease rapidly and disappear	lessen the authority, dignity, or reputation of
cease to exist
pass away rapidly
become invisible or unnoticeable