Yes, zero is playable
...and is worth 13 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Zero" Definition
noun
A sight setting that enables a firearm to shoot on target.
Informal Nothing; nil: Today I accomplished zero.
Informal One having no influence or importance; a nonentity: a manager who was a total zero.
Mathematics A cardinal number indicating the absence of any or all units under consideration.
adjective
Having no measurable or otherwise determinable value.
Informal Absent, inoperative, or irrelevant in specified circumstances: "The town has . . . practically no opportunities for amusement, zero culture” ( Robert M. Adams).
Linguistics Of or relating to a morpheme that is expected by an established, regular paradigm but has no spoken or written form. Moose has a zero plural; that is, its plural is moose.
Meteorology Designating a ceiling not more than 16 meters (52 feet) high.
Meteorology Limited in horizontal visibility to no more than 55 meters (180 feet).
verb-transitive
To adjust (an instrument or a device) to zero value.
phrasal-verb
Zero in To adjust the aim or sight of by repeated firings.
Zero in To aim or concentrate firepower on an exact target location.
Zero in To converge intently; close in: The children zeroed in on the display of toys in the store window.
Zero out To eliminate (a budget or budget item) by cutting off funding.
Zero out To reduce to zero.
verb
To determine or adjust the zero of (as a rifle).
To concentrate firepower on the exact range of.
To adjust fire on a specific target.
To close in on or focus attention on an objective.
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