This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One that coasts, as:

n. One who acts in an aimless manner.

n. A sled or toboggan.

n. One who rides a sled or toboggan.

n. Nautical A vessel engaged in coastal trade: "dirty British coaster with a salt-caked smokestack” ( John Masefield).

n. A roller coaster.

n. A small mat or plate placed under a vessel to protect a tabletop or other surface beneath.

n. A small tray, often on wheels, for passing something, such as a wine decanter, around a table.

n. A resident of a coastal region.

n. Agent noun of coast: one who coasts.

n. Something that coasts, such as a sled or toboggan.

n. A merchant vessel that stays in coastal waters.

n. A person who originates from or inhabits a coastal area.

n. A small piece of material used to protect the surface of a table, upon which one places cups or mugs.

n. A small tray on wheels, used to pass something around a table.

n. A worthless compact disc or DVD, such as one that was burned incorrectly.

n. A rollercoaster.

n. A vessel employed in sailing along a coast, or engaged in the coasting trade.

n. One who sails near the shore.

n. One who or that which coasts.

n. A vessel used in this service; a coasting-vessel.

n. One engaged in the sport of coasting or sledding.

n. A teamster who draws supplies to lumberers' shanties.

n. A low round tray, usually of silver, and formerly on wheels, in which a decanter “coasts” or makes the circuit of a dining-table, for the greater convenience of the company.

n. An inhabitant of or a dweller near the sea-coast.

n. A loafer. See coast, v. i., 9.

n. A name applied to cattle bred on or near the coast.

n. a resident of a coastal area

n. someone who coasts

n. a covering (plate or mat) that protects the surface of a table (i.e., from the condensation on a cold glass or bottle)

"On the other coaster is a 3/4 empty can of Diet Mt. Dew."

occupier    resident    occupant    mover    protection    protective cover    protective covering   

roller coaster   

poster    roaster    toaster   

lugger    roller coaster    felucca    sloop    yacht    barge    brig    freighter    steamer    bumblebee