windsock vs visual signal

windsock and visual signal both are nouns.

Word	Noun	Adjective	Verb	Adverb
windsock	Yes	No	No	No
visual signal	Yes	No	No	No

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

windsock: a truncated cloth cone mounted on a mast; used (e.g., at airports) to show the direction of the wind
visual signal: a signal that involves visual communication

windsock (noun)	visual signal (noun)
a truncated cloth cone mounted on a mast; used (e.g., at airports) to show the direction of the wind	a signal that involves visual communication