fail vs croak

fail is not a noun while croak is a noun.

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

fail (noun)	croak (noun)
	a harsh hoarse utterance (as of a frog)

fail (verb)	croak (verb)
stop operating or functioning	pass from physical life and lose all bodily attributes and functions necessary to sustain life
deteriorate	make complaining remarks or noises under one's breath
prove insufficient	utter a hoarse sound, like a raven
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