flush toilet vs commode

flush toilet and commode both are nouns.

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

As nouns, commode is a hypernym of flush toilet; that is, commode 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
commode: a plumbing fixture for defecation and urination

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

flush toilet (noun)	commode (noun)
a toilet that is cleaned of waste by the flow of water through it	a plumbing fixture for defecation and urination
	a tall elegant chest of drawers