There are various words that can be used as synonyms for the term "head rest." Some of the common alternatives include head pad, neck cushion, head support, and pillow. These synonyms refer to a cushioning device designed for supporting the head and neck. Certain other synonyms for headrest could be backrest, lumbar support, bolster, or sofa cushion. In aircraft, a similar fitting is called a headrest, which might have air freshness components to keep the space odor-free. In summary, regardless of the word used to describe it, the headrest is an essential device with adequate padding and cushioning to help support the head and neck and to promote comfortable sitting posture.