potty vs potty seat

potty and potty seat both are nouns.

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

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

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

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