toilet vs plumbing fixture

toilet and plumbing fixture both are nouns.

Word	Noun	Adjective	Verb	Adverb
toilet	Yes	No	No	No
plumbing fixture	Yes	No	No	No

As nouns, plumbing fixture is a hypernym of toilet; that is, plumbing fixture is a word with a broader meaning than toilet:

toilet: a plumbing fixture for defecation and urination
plumbing fixture: a fixture for the distribution and use of water in a building

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