W vs w

W and w both are nouns.

Word	Noun	Adjective	Verb	Adverb
W	Yes	No	No	No
w	Yes	No	No	No

As nouns, W and w are synonyms defined as:

Other synonyms of W include double-u.

W (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