flush toilet vs toilet

flush toilet and toilet both are nouns.

Word	Noun	Adjective	Verb	Adverb
flush toilet	Yes	No	No	No
toilet	Yes	No	No	No

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

flush toilet: a toilet that is cleaned of waste by the flow of water through it
toilet: a plumbing fixture for defecation and urination

Other hypernyms of flush toilet include can, commode, crapper, pot, potty, stool, throne.

flush toilet (noun)	toilet (noun)
a toilet that is cleaned of waste by the flow of water through it	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