Yes, shift is playable
...and is worth 10 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Shift" Definition
noun
A change from one person or configuration to another; a substitution.
A change in attitude, judgment, or emphasis.
A change in direction: a shift in the wind.
A change in position, as:.
A group of workers that relieve another on a regular schedule.
verb
To exchange for or replace by another .
To change the place, position, or direction of .
To make a change in (place).
To change place or position.
verb-transitive
Linguistics To alter phonetically as part of a systematic historical change.
To alter (position or place).
To change (gears), as in an automobile.
To exchange (one thing) for another of the same class: shifted assignments among the students.
To move or transfer from one place or position to another.
verb-intransitive
Linguistics To be altered as part of a systematic historical change. Used of speech sounds.
To change gears, as when driving an automobile.
To change position, direction, place, or form.
To get along by tricky or evasive means.
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