* For a piece of furniture: tabouret
* For a bowel movement: selles (plural) or tabouret (informal, can be considered rude)
Example:
* Je suis allé acheter un tabouret pour mon bureau. (I went to buy a stool for my desk.)
* Le médecin a demandé à la patiente de décrire ses selles. (The doctor asked the patient to describe their stools.)
It's important to be aware of the context and choose the appropriate word.