It is the difference between Muji and a Louis Seize fauteuil.
From the telegraph.co.uk
Did we end up sitting in the same fauteuil?
From the heraldtribune.com
The rust and dust of their long exile in cellars and attics are as carefully preserved as the patina on a Louis XV fauteuil.
From the time.com
In French, a distinction is made between fauteuil and chaise, the terms for chairs with and without armrests, respectively.
From the en.wikipedia.org
Besides a cupboard to store the kitchenware, there were a table and chairs, where the family would dine, and sometimes-if space allowed-even a fauteuil or a couch.
From the en.wikipedia.org
Furniture could be easily moved around for gatherings, and many specialized forms came to be such as the fauteuil chair, the voyeuse chair, and the berger en gondola.
From the en.wikipedia.org
More examples
An upholstered armchair
A fauteuil is a style of open-arm chair with a primarily exposed wooden frame originating in France in the early eighteenth century. A fauteuil is made of wood, and frequently with carved relief ornament. It is typically upholstered on the seat, the seat back and on the arms (manchettes). ...
A French name for an elegant, comfortable chair with open arms and upholstered back and seat, dating from the mid-18th century and originally covered in silk, satin, velvet or damask, usually replaced in 19th century with tapestry.
An open-armed armchair originating in France
A fully upholstered French armchair with open arms.