bugle call vs taps

bugle call and taps both are nouns.

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

As nouns, taps is a hyponym of bugle call; that is, taps is a word with a more specific, narrower meaning than bugle call:

Other hyponyms of bugle call include recall, lights-out, reveille, wake-up signal, retreat, tattoo.

bugle call (noun)	taps (noun)
a signal broadcast by the sound of a bugle	(military) signal to turn the lights out