The initial idioms of the letter D

Department of Defense	Department of Defense Laboratory System
department of economics	Department of Education
Department of Energy	department of English
Department of Health and Human Services	Department of Health Education and Welfare
department of history	Department of Homeland Security
Department of Housing and Urban Development	Department of Justice
Department of Justice Canada	Department of Labor
department of linguistics	department of local government
department of mathematics	department of music
department of philosophy	department of physics
department of psychology	department of sociology
Department of State	department of the federal government
Department of the Interior	Department of the Treasury
Department of Transportation	Department of Veterans Affairs
department store	departure