Yes, bank is playable
...and is worth 12 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Bank" Definition
noun
A business establishment in which money is kept for saving or commercial purposes or is invested, supplied for loans, or exchanged.
A large elevated area of a sea floor. Often used in the plural.
A piled-up mass, as of snow or clouds. See Synonyms at heap.
A row of keys on a keyboard.
phrasal-verb
Bank on To have confidence in; rely on.
verb-transitive
Games To strike (a billiard ball) so that it rebounds from the cushion of the table.
Sports To play (a ball or puck) in such a way as to make it glance off a surface, such as a backboard or wall.
To arrange or set up in a row: "Every street was banked with purple-blooming trees” ( Doris Lessing).
To border or protect with a ridge or embankment.
To construct with a slope rising to the outside edge: The turns on the racetrack were steeply banked.
verb-intransitive
To rise in or take the form of a bank.
To tilt an aircraft or a motor vehicle laterally when turning.
To transact business with a bank or maintain a bank account.
verb
To cover (as a fire) with fresh fuel and adjust the draft of air so as to keep in an inactive state.
To build (a curve) with the roadbed or track inclined laterally upward from the inside edge.
To heap or pile in a bank.
To drive (a ball in billiards) into a cushion.
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