all clear vs signalling

all clear and signalling both are nouns.

Word	Noun	Adjective	Verb	Adverb
all clear	Yes	No	No	No
signalling	Yes	No	No	No

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

Other hypernyms of all clear include sign, signal, signaling.

all clear (noun)	signalling (noun)
a signal (usually a siren) that danger is over	any nonverbal action or gesture that encodes a message
permission to proceed because obstacles have been removed