upholsters is a form of:

Upholster



verb
1.
(TRANSITIVE) (To fit [furniture, etc.] with covering, etc., to stuff and cover furniture) ស្រោបសំពត់ពីក្រៅ, ក្រាល, ដោយគ្រឿងប៉ាក់, គ្រប, ខ្ទប់, បិទ, របស់ចាំបាច់, តាក់តែងដោយតុទូ, ទ្រាប់, បំពេញ
Example: The old chair we upholstery now looks new.
ENGLISH MEANING
verb
1.
(TRANSITIVE) To furnish (rooms, carriages, bedsteads, chairs, etc.) with hangings, coverings, cushions, etc.; to adorn with furnishings in cloth, velvet, silk, etc.; as, to upholster a couch; to upholster a room with curtains.
1.
An upholsterer
2.
A broker