flushless toilet vs commode

flushless toilet and commode both are nouns.

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

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

flushless toilet: a toilet that relies on bacteria to break down waste matter (instead of using water)
commode: a plumbing fixture for defecation and urination

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

flushless toilet (noun)	commode (noun)
a toilet that relies on bacteria to break down waste matter (instead of using water)	a plumbing fixture for defecation and urination
	a tall elegant chest of drawers