telephone number vs signalling

telephone number and signalling both are nouns.

Word	Noun	Adjective	Verb	Adverb
telephone number	Yes	No	No	No
signalling	Yes	No	No	No

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

Other hypernyms of telephone number include sign, signal, signaling.

telephone number (noun)	signalling (noun)
the number is used in calling a particular telephone	any nonverbal action or gesture that encodes a message