The following words are Bedspread Words™ because:
Using the standard number of tiles in a Scrabble set, a blank tile will be needed to write out the word. If you lookup "Bedspread" in a thesaurus, you will find the word "Blanket", which makes sense in this case.
Table:
Proof:
XEROX (1 X in Scrabble, 1 blank tile);
FLUFFY (2 Fs in Scrabble, 1 blank tile);
JUJITSU (1 J in Scrabble, 1 blank tile);
BUBBLES (2 Bs in Scrabble, 1 blank tile);
ECLECTIC (2 Cs in Scrabble, 1 blank tile);
PINEAPPLE (2 Ps in Scrabble, 1 blank tile);
CHIHUAHUA (2 Hs in Scrabble, 1 blank tile);
CLOCKWORK (1 K in Scrabble, 1 blank tile);
COMMUNISM (2 Ms in Scrabble, 1 blank tile).
Words which are not Bedspread Words™
can be made with the standard Scrabble letter count.
ZIGZAGGING is a Double Bedspread Word™ because:
ZIGZAGGING (3 Gs and 1 Z in Scrabble, 1 blank tile for G, 1 blank tile for Z)...
Therefore, two blank (bedspread) tiles are needed.