bugle call vs signal

bugle call and signal both are nouns.

Word	Noun	Adjective	Verb	Adverb
bugle call	Yes	No	No	No
signal	Yes	Yes	Yes	No

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

Other hypernyms of bugle call include sign, signaling, signalling.

bugle call (noun)	signal (noun)
a signal broadcast by the sound of a bugle	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

bugle call (adjective)	signal (adjective)
	notably out of the ordinary

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