prefigure vs signal

prefigure is not a noun while signal is a noun.

Word	Noun	Adjective	Verb	Adverb
prefigure	No	No	Yes	No
signal	Yes	Yes	Yes	No

As verbs, signal is a hypernym of prefigure; that is, signal is a word with a broader meaning than prefigure:

Other hypernyms of prefigure include bespeak, betoken, indicate, point.

prefigure (noun)	signal (noun)
	any nonverbal action or gesture that encodes a message
	any incitement to action
	an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes

prefigure (adjective)	signal (adjective)
	notably out of the ordinary

prefigure (verb)	signal (verb)
indicate, as with a sign or an omen	communicate silently and non-verbally by signals or signs
imagine or consider beforehand	be a signal for or a symptom of