
der Stuhl
chair
A piece of furniture for one person with a seat, legs, and usually a backrest.
Wir brauchen noch einen Stuhl, weil ein Gast mehr kommt.
We still need one more chair because one extra guest is coming.
chair / stool
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chair
A piece of furniture for one person with a seat, legs, and usually a backrest.
Wir brauchen noch einen Stuhl, weil ein Gast mehr kommt.
We still need one more chair because one extra guest is coming.

stool
A medical term for human excrement; feces. Often also referred to as 'Stuhlgang' (bowel movement).
Der Arzt fragte den Patienten nach der Farbe und Konsistenz von seinem Stuhl.
The doctor asked the patient about the color and consistency of his stool.

to sit between two stools
To be in a difficult situation in which one cannot or does not want to choose between two opposing options or parties.
Seit der Scheidung seiner Eltern sitzt das Kind oft zwischen zwei Stühlen.
Since his parents' divorce, the child often sits between two stools.
The meaning 'Kot' (feces) for 'Stuhl' (stool) is used almost exclusively in a medical context, for example at the doctor's office or in a hospital. In everyday situations, using it can lead to embarrassing misunderstandings.
Für die Untersuchung ist eine Stuhlprobe erforderlich.
A stool sample is required for the examination.
As a piece of furniture, 'Stuhl' (chair) is often combined with verbs of position or movement. Typical phrases are 'auf einem Stuhl sitzen' (to sit on a chair), 'sich auf einen Stuhl setzen' (to sit down on a chair), or 'einen Stuhl an den Tisch rücken' (to move a chair up to the table).
Kannst du bitte noch einen Stuhl aus dem Keller holen?
Could you please get one more chair from the basement?
The idiom 'zwischen zwei Stühlen sitzen' (to sit between two stools) is fixed and describes a difficult decision-making situation or a conflict of loyalty. The structure always stays the same.
Als Manager muss er oft zwischen den Interessen der Mitarbeiter und der Firmenleitung entscheiden und sitzt dabei zwischen zwei Stühlen.
As a manager, he often has to decide between the interests of the employees and the company leadership, and in doing so he sits between two stools.
'Stuhl' (chair) is the base word for many types of seating furniture. Examples include 'Bürostuhl' (office chair), 'Rollstuhl' (wheelchair), 'Liegestuhl' (deck chair), or 'Kinderstuhl' (child's chair/high chair).
Mein neuer Bürostuhl ist viel bequemer als der alte.
My new office chair is much more comfortable than the old one.
armchair / chair
Der Stuhl and der Sessel both refer to a piece of seating for one person. In standard German, a Sessel is usually softly upholstered and has armrests, while a Stuhl is more ordinary and often unupholstered. In Austria, however, Sessel can also mean a simple chair.

Im deutschen Möbelgeschäft setzte ich mich auf einen einfachen Holzstuhl.
In the German furniture store, I sat down on a simple wooden chair.
Im österreichischen Möbelgeschäft setzte ich mich auf einen einfachen Holzsessel.
In the Austrian furniture store, I sat down on a simple wooden chair.