W.C. vs toilet

W.C. and toilet both are nouns.

Word	Noun	Adjective	Verb	Adverb
W.C.	Yes	No	No	No
toilet	Yes	No	No	No

As nouns, toilet is a hypernym of W.C.; that is, toilet is a word with a broader meaning than W.C.:

Other hypernyms of W.C. include bathroom, can, john, lav, lavatory, privy.

W.C. (noun)	toilet (noun)
a toilet in Britain	the act of dressing and preparing yourself
	a room or building equipped with one or more toilets
	a plumbing fixture for defecation and urination
	misfortune resulting in lost effort or money