fail vs disappoint

fail and disappoint both are verbs.

Word	Noun	Adjective	Verb	Adverb
fail	No	No	Yes	No
disappoint	No	No	Yes	No

As verbs, disappoint is a hypernym of fail; that is, disappoint is a word with a broader meaning than fail:

Other hypernyms of fail include let down.

fail (verb)	disappoint (verb)
stop operating or functioning	fail to meet the hopes or expectations of
deteriorate
prove insufficient
disappoint, prove undependable to; abandon, forsake
become bankrupt or insolvent; fail financially and close
be unsuccessful
fail to get a passing grade
fail to do something; leave something undone
judge unacceptable
be unable
fall short in what is expected