worsen vs fail

worsen and fail both are verbs.

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

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

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