Yes, grade 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)
"Grade" Definition
noun
A domestic animal produced by crossbreeding one of purebred stock with one of ordinary stock.
A group of students at such a level: The third grade has recess at 10:30.
A level of academic development in an elementary, middle, or secondary school: learned fractions in the fourth grade.
A military, naval, or civil service rank.
A position in a scale of size, quality, or intensity: a poor grade of lumber.
verb-transitive
To arrange in a series or according to a scale.
To arrange in steps or degrees.
To determine the quality of (academic work, for example); evaluate: graded the book reports.
To give a grade to (a student, for example).
verb-intransitive
To change or progress gradually: piles of gravel that grade from coarse to fine.
To hold a certain rank or position.
verb
To arrange in a scale or series.
To assign to a grade or assign a grade to.
To level off to a smooth horizontal or sloping surface.
adjective
Being, involving, or yielding domestic animals of improved but not pure stock.
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