sock vs visual signal

sock and visual signal both are nouns.

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

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

sock: 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

sock (noun)	visual signal (noun)
hosiery consisting of a cloth covering for the foot; worn inside the shoe; reaches to between the ankle and the knee	a signal that involves visual communication
a truncated cloth cone mounted on a mast; used (e.g., at airports) to show the direction of the wind

sock (verb)	visual signal (verb)
hit hard