animal communication vs signal

animal communication and signal both are nouns.

Word	Noun	Adjective	Verb	Adverb
animal communication	Yes	No	No	No
signal	Yes	Yes	Yes	No

As nouns, signal is a hypernym of animal communication; that is, signal is a word with a broader meaning than animal communication:

Other hypernyms of animal communication include sign, signaling, signalling.

animal communication (noun)	signal (noun)
communication between animals (of the same species)	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

animal communication (adjective)	signal (adjective)
	notably out of the ordinary

animal communication (verb)	signal (verb)
	communicate silently and non-verbally by signals or signs
	be a signal for or a symptom of