potty vs potty chair

potty and potty chair both are nouns.

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

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

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

potty (noun)	potty chair (noun)
a receptacle for urination or defecation in the bedroom	toilet consisting of a small seat used by young children
a plumbing fixture for defecation and urination

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