The Oxford Thesaurus An A-Z Dictionary of Synonyms - partner n.

1) sharer, partaker, associate, colleague, participant, accomplice, accessory, confederate, comrade, ally, collaborator, companion, team-mate, fellow, alter ego, friend, Colloq pal, sidekick, mate, US and Canadian buddy, cohort: His partner in the bank robbery was arrested this morning. 2) wife or husband, spouse, mate, helpmate, helpmeet, consort: She became my life partner more than 50 years ago. 3) companion, fellow-dancer: Won't you change partners and dance with me?