What is another word for back-rest?
Pronunciation: [bˈakɹˈɛst] (IPA) 
A back-rest is typically a support or cushion that provides comfort to the back when seated or reclining. However, there are several synonyms that can be used interchangeably with back-rest. Some of the common synonyms include lumbar support, back cushion, ergo rest, back pillow, lumbar cushion, and spine cushion. These alternatives offer similar support and comfort to the back in different positions, such as sitting or lying down. Some models of back-rests are also designed to alleviate pain and tension in specific areas of the back, for example, the lower back or upper back. Ultimately, using synonyms for back-rest can help one express the same concept in different ways.
