signal vs predict

signal is a noun but predict is not a noun.

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

As verbs, predict is a hyponym of signal; that is, predict is a word with a more specific, narrower meaning than signal:

signal (noun)	predict (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

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

signal (verb)	predict (verb)
communicate silently and non-verbally by signals or signs	make a prediction about; tell in advance
be a signal for or a symptom of	indicate, as with a sign or an omen