fail vs fall through

fail and fall through both are verbs.

Word	Noun	Adjective	Verb	Adverb
fail	No	No	Yes	No
fall through	No	No	Yes	No

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

fail (verb)	fall through (verb)
stop operating or functioning	fail utterly; collapse
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