commode vs potty chair

commode and potty chair both are nouns.

Word	Noun	Adjective	Verb	Adverb
commode	Yes	No	No	No
potty chair	Yes	No	No	No

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

Other hyponyms of commode include flushless toilet, flush toilet, lavatory, potty seat.

commode (noun)	potty chair (noun)
a plumbing fixture for defecation and urination	toilet consisting of a small seat used by young children
a tall elegant chest of drawers