Yes, arch is playable
...and is worth 9 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Arch" Definition
noun
A curve with the ends down and the middle up: the arch of a raised eyebrow.
A structure, especially one of masonry, forming the curved, pointed, or flat upper edge of an open space and supporting the weight above it, as in a bridge or doorway.
A structure, such as a freestanding monument, shaped like an inverted U.
Anatomy An organ or structure having a curved or bowlike appearance, especially either of two arched sections of the bony structure of the foot.
A typically curved structural member spanning an opening and serving as a support (as for the wall or other weight above the opening).
adjective
Chief; principal: their arch foe.
Mischievous; roguish: an arch glance.
Marked by a deliberate and often forced playfulness, irony, or impudence .
verb-transitive
To bend backward: The dancers alternately arched and hunched their backs.
To cause to form an arch or similar curve.
To provide with an arch: arch a passageway.
To span: "the rude bridge that arched the flood” ( Ralph Waldo Emerson).
verb-intransitive
To form an arch or archlike curve: The high fly ball arched toward the stands.
verb
To cover or provide with an arch.
To take an arch-shaped course.
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