signalling vs communication

signalling and communication both are nouns.

Word	Noun	Adjective	Verb	Adverb
signalling	Yes	No	No	No
communication	Yes	No	No	No

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

signalling: any nonverbal action or gesture that encodes a message
communication: something that is communicated by or to or between people or groups

signalling (noun)	communication (noun)
any nonverbal action or gesture that encodes a message	something that is communicated by or to or between people or groups
	the activity of communicating; the activity of conveying information
	a connection allowing access between persons or places