Potty Chair Vs Potty Seat

potty chair
potty seat: toilet consisting of a small seat used by young children
A close stool, used from at least the sixteenth century until the introduction of indoor plumbing, was an enclosed cabinet or box at sitting height with an opening in the top, which may be disguised by a folding outer lid.

seat
a space reserved for sitting (as in a theater or on a train or airplane); "he booked their seats in advance"; "he sat in someone else's place"
show to a seat; assign a seat for; "The host seated me next to Mrs. Smith"
The roughly horizontal part of a chair, on which one's weight rests directly
A thing made or used for sitting on, such as a chair or stool
be able to seat; "The theater seats 2,000"
A sitting place for a passenger in a vehicle or for a member of an audience