bed - a piece of furniture used for sleeping or resting on
sheet - a rectangular piece of fabric used to cover a bed or mattress
bed sheet - a single sheet used to cover a bed or mattress
bed sheets - multiple sheets used to cover a bed or mattress
bedding - the collective term for all the materials used on a bed, including sheets, blankets, and pillows
bedding set - a coordinated collection of bedding items, usually including a sheet, pillowcases, and a comfort
