The plural is MATTRESSES. See dictionary.com http://dictionary.reference.com/search?q=Mattresses
The plural is mattresses. The plural possessive is mattresses'.
DreamCloud: the luxury hybrid mattress combining the best of latex, memory foam, tufting and coil technology to provide the best sleep money can buy.
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The plural of mattress is mattresses.
beddings.add s
pillows.
The possessive form of the singular noun mattress is mattress's.Example: The mattress's thick padding made it very comfortable.
The singular possessive form is heart's; the plural possessive form is hearts'.
The plural form is homes; the plural possessive is homes'.
The plural of rose is roses. The plural possessive is roses'.
The plural possessive is regions'.
The possessive form of the singular noun mattress is mattress's.Example: The mattress's thick padding made it very comfortable.
The possessive form for the noun mattress is mattress's.Example: The mattress's satin brocade cover looked very expensive.
The plural is relatives. The plural possessive is relatives'.
The plural is lads. The plural possessive is lads'.
The plural form is Mexicans. The plural possessive is Mexicans'.
The plural possessive of stepsister is stepsisters'.
The plural form is suffixes. The plural possessive is suffixes'.
The plural form is echoes. The plural possessive is echoes'.
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
The plural possessive is pals'.
Studies' is the plural possessive of study.
The plural possessive of bandit is bandits'.