fail vs go down

fail and go down both are verbs.

Word	Noun	Adjective	Verb	Adverb
fail	No	No	Yes	No
go down	No	No	Yes	No

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

Other hyponyms of fail include crash, blow, blow out, burn out, misfire, malfunction, misfunction.

fail (verb)	go down (verb)
stop operating or functioning	grow smaller
deteriorate	stop operating
prove insufficient	be defeated
disappoint, prove undependable to; abandon, forsake	be ingested
become bankrupt or insolvent; fail financially and close	go under
be unsuccessful	disappear beyond the horizon
fail to get a passing grade	move downward and lower, but not necessarily all the way
fail to do something; leave something undone	be recorded or remembered
judge unacceptable
be unable
fall short in what is expected