Yes, smear 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)
"Smear" Definition
noun
A mark made by smearing; a spot or blot.
A substance to be spread on a surface.
A vilifying or slanderous remark.
Biology A sample, as of blood or bacterial cells, spread on a slide for microscopic examination or on the surface of a culture medium.
verb-transitive
Slang To defeat utterly; smash.
To apply by spreading or daubing: smeared suntan lotion on my face and arms.
To spread or daub with a sticky, greasy, or dirty substance.
To stain by or as if by spreading or daubing with a sticky, greasy, or dirty substance.
To stain or attempt to destroy the reputation of; vilify: political enemies who smeared his name.
verb-intransitive
To be or become stained or dirtied.
verb
To overspread with something unctuous, viscous, or adhesive .
To spread over a surface.
To stain, smudge, or dirty by or as if by .
To vilify especially by secretly and maliciously spreading grave charges and imputations.
To obliterate, obscure, blur, blend, wipe out, or defeat by or as if by smearing.
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