betoken vs signal

betoken is not a noun while signal is a noun.

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

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

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

As verbs, betoken and signal are synonyms defined as:

Other synonyms of betoken include bespeak, indicate, point.

betoken (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

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

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