Yes, the "back" of a chair is just called the "back". You could call it a back rest too, I guess. "The back of the chair SUPPORTS my back", or "I REST my back on the back of the chair".
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Mister Micawber- No, I wouldn't say anything like that unless I were speaking to an alien from another planet.Haha, okay, I can see what you mean
KrisBlueNZPerhaps encloses, (en)shrouds,surrounds, cocoons, hugs, cups, cuddles. Other words from thesaurus.com: embraces,grips, coddles, nestles (my back nestles in the chair), clutch, enfolds, encases, encloses,enfolds, ensconces, envelops, clasps.Oh Gawd! I'll try to stuff them in to my head. Thanks for this impressive list.