cardinal compass point vs W

cardinal compass point and W both are nouns.

Word	Noun	Adjective	Verb	Adverb
cardinal compass point	Yes	No	No	No
W	Yes	No	No	No

As nouns, W is a hyponym of cardinal compass point; that is, W is a word with a more specific, narrower meaning than cardinal compass point:

Other hyponyms of cardinal compass point include due north, N, north, northward, due east, E, east, eastward, due south, S, south, southward, due west, west, westward.

cardinal compass point (noun)	W (noun)
one of the four main compass points	the 23rd letter of the Roman alphabet
	a unit of power equal to 1 joule per second; the power dissipated by a current of 1 ampere flowing across a resistance of 1 ohm
	the cardinal compass point that is at 270 degrees
	a heavy grey-white metallic element; the pure form is used mainly in electrical applications; it is found in several ores including wolframite and scheelite