signal vs intercommunicate

signal is a noun but intercommunicate is not a noun.

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

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

Other hypernyms of signal include communicate.

signal (noun)	intercommunicate (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)	intercommunicate (adjective)
notably out of the ordinary

signal (verb)	intercommunicate (verb)
communicate silently and non-verbally by signals or signs	transmit thoughts or feelings
be a signal for or a symptom of	be interconnected, afford passage