fail vs worsen

fail and worsen both are verbs.

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

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

Other hypernyms of fail include decline.

fail (verb)	worsen (verb)
stop operating or functioning	grow worse
deteriorate	make worse
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