double-u vs W

double-u and W both are nouns.

Word	Noun	Adjective	Verb	Adverb
double-u	Yes	No	No	No
W	Yes	No	No	No

As nouns, double-u and W are synonyms defined as:

Other synonyms of double-u include w.

double-u (noun)	W (noun)
the 23rd letter of the Roman alphabet	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