WordRel.com

• a relation between people; (`relationship' is often used where `relation' would serve, as in `the relationship between inflation and unemployment', but the preferred usage of `relationship' is for human relations or states of relatedness)

  synonym	human relationship
  derivation	relationrelation
  hypernym	relation
  hyponym	bromancepartnershippersonal relationpersonal relationship

• (anthropology) relatedness or connection by blood or marriage or adoption

  synonym	family relationshipkinship
  derivation	relationrelation
  domain topic	anthropology
  hypernym	relation
  hyponym	affinityaffinitybirthblood kinshipbrotherhoodcognationconsanguinitydescentfatherhoodfiliationline of descentlineagemarital bedmarital relationshipmaternitymotherhoodparentagepaternityphylogenetic relationsisterhoodsistership

• a state of connectedness between people (especially an emotional connection)

  derivation	relationrelation
  hypernym	state
  hyponym	anaclisislove affairromancesexual relationship

• a state involving mutual dealings between people or parties or countries

  derivation	relation
  hypernym	state
  hyponym	accountacquaintanceacquaintanceshipaffiliationassimilationassociationbusiness relationshipfriendly relationshipfriendshipmembershipsubjectionsubjugationtietie-up