Pillowcases and Duvet Covers
Puzzle 18 of Sci-fi Universe Medium Pack
Question is: Pillowcases and Duvet Covers
and the answer is: BEDLINEN
Word Meaning:
BEDLINEN — The items of cloth used to make up a bed, such as sheets and pillowcases, formerly made of linen but now manufactured in a wide variety of material such as cotton or polyester.
Definitions from Wiktionary.