externship
From Longman Dictionary of Contemporary Englishexternshipex‧tern‧ship /ˈekstɜːnʃɪp $ -tɜːrn-/ noun [countable] American English a job that a university student does in order to gain experience in a particular area of work. Externships are usually not paid and usually last only a short time → extern, internship an externship in a law firm