signify vs mean

signify is not a noun while mean is a noun.

Word	Noun	Adjective	Verb	Adverb
signify	No	No	Yes	No
mean	Yes	Yes	Yes	No

As verbs, mean is a hypernym of signify; that is, mean is a word with a broader meaning than signify:

Other hypernyms of signify include intend.

As verbs, signify and mean are synonyms defined as:

Other synonyms of signify include intend, stand for.

signify (noun)	mean (noun)
	an average of n numbers computed by adding some function of the numbers and dividing by some function of n

signify (adjective)	mean (adjective)
	of no value or worth
	having or showing an ignoble lack of honor or morality
	characterized by malice
	approximating the statistical norm or average or expected value
	marked by poverty befitting a beggar
	(used of sums of money) so small in amount as to deserve contempt
	(used of persons or behavior) characterized by or indicative of lack of generosity
	very good; of the highest quality

signify (verb)	mean (verb)
convey or express a meaning	have in mind as a purpose
make known with a word or signal	intend to refer to
denote or connote	destine or designate for a certain purpose
	mean or intend to express or convey
	denote or connote
	have as a logical consequence
	have a specified degree of importance