Yes, fog is playable
...and is worth 8 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Fog" Definition
noun
A blur on a developed photographic image.
A cloud of vaporized liquid, especially a chemical spray used in fighting fires.
A mist or film clouding a surface, as of a window, lens, or mirror.
A new growth of grass appearing on a field that has been mowed or grazed.
A state of mental vagueness or bewilderment.
verb-intransitive
To be blurred, clouded, or obscured: My glasses fogged in the warm air.
To be covered with or as if with fog.
To be dimmed or obscured. Used of a photographic image.
verb-transitive
To cause to be obscured; cloud.
To cover or envelop with or as if with fog.
To make vague, hazy, or confused: a memory that had been fogged by time.
To obscure or dim (a photographic image).
verb
To cover, envelop, or suffuse with or as if with fog.
To make obscure or confusing.
To produce fog on (as a photographic film) during development.
To become covered or thick with fog.
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