beacon fire vs visual signal

beacon fire and visual signal both are nouns.

Word	Noun	Adjective	Verb	Adverb
beacon fire	Yes	No	No	No
visual signal	Yes	No	No	No

As nouns, visual signal is a hypernym of beacon fire; that is, visual signal is a word with a broader meaning than beacon fire:

beacon fire: a fire (usually on a hill or tower) that can be seen from a distance
visual signal: a signal that involves visual communication

beacon fire (noun)	visual signal (noun)
a fire (usually on a hill or tower) that can be seen from a distance	a signal that involves visual communication