potty vs flush toilet

potty and flush toilet both are nouns.

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

As nouns, flush toilet is a hyponym of potty; that is, flush toilet is a word with a more specific, narrower meaning than potty:

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

Other hyponyms of potty include flushless toilet, lavatory, potty chair, potty seat.

potty (noun)	flush toilet (noun)
a receptacle for urination or defecation in the bedroom	a toilet that is cleaned of waste by the flow of water through it
a plumbing fixture for defecation and urination

potty (adjective)	flush toilet (adjective)
slightly intoxicated
marked by foolish or unreasoning fondness
(British informal) trivial