Scrabble Dictionary

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Yes, relation is playable

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Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Relation" Definition

noun

A logical or natural association between two or more things; relevance of one to another; connection: the relation between smoking and heart disease.
A narrative; an account.
A person connected to another by blood or marriage; a relative.
Law The principle whereby an act done at a later date is considered to have been done on a prior date.
Reference; regard: in relation to your inquiry.