toilet bowl; urinal; chamber pot; bedpan
Refers to the fixture or receptacle itself, not the room. Covers Western-style toilet bowls, Japanese squat toilets, urinals, and portable containers like chamber pots and bedpans.
I clean the toilet bowl every Sunday.
We replaced the toilet bowl with a new one.
A portable bedpan is provided in the hospital room.
The toilet bowl got clogged because too much toilet paper was flushed at once.
Since it was getting old, we decided to replace the toilet bowl.
おまる is a small portable potty made for young children, whereas 便器 is the general term for any toilet fixture, including household and public ones.
便器 refers to the whole toilet bowl/fixture, while 便座 is specifically the seat part attached to it.
counter for small objects; counter for pieces · counter for military units · individual; one person · counter for years of age difference; counter for school years
Compound of 便 (ben, 'excrement' or 'convenience') and 器 (ki, 'vessel' or 'container'). The reading is on'yomi.