Yes, rank is playable
...and is worth 9 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Rank" Definition
noun
A body of people classed together; numbers: joined the ranks of the unemployed.
A line of soldiers, vehicles, or equipment standing side by side in close order.
A relative position in a society.
A relative position or degree of value in a graded group.
A row, line, series, or range.
verb
To arrange in lines or in a regular formation.
To determine the relative position of .
To take or have a position in relation to others .
adjective
Absolute; complete: a rank amateur; a rank stranger.
Conspicuously offensive: rank treachery. See Synonyms at flagrant.
Growing profusely or with excessive vigor: rank vegetation in the jungle.
Strong and offensive in odor or flavor.
Yielding a profuse, often excessive crop; highly fertile: rank earth.
verb-intransitive
Slang To engage in carping criticism. Often used with on: Stop ranking on me all the time.
To form or stand in a row or rows.
To hold a particular rank: ranked first in the class.
verb-transitive
To give a particular order or position to; classify.
To outrank or take precedence over.
To place in a row or rows.
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