bölüm

/bølym/

Cases

SingularPluralWhen to use it
nominativebölümthe departmentbölümlethe departmentsthe plain dictionary form — the doer of the sentence
genitivebölümnüthe department'sbölümlenithe departments'the owner — whose it is
accusativebölümnüthe department (as the object)bölümlenithe departments (as the object)a specific, known object — whom or what
dativebölümgeto the departmentbölümlegeto the departmentsdirection or recipient — to where, to whom
locativebölümdeat / in the departmentbölümledeat / in the departmentswhere it is; also having — mende bar, "I have it"
ablativebölümdenfrom the departmentbölümledenfrom the departmentswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
mybölümümmy departmentbölümlerimmy departments
yourbölümüngyour departmentbölümleringyour departments
his / herbölümühis / her departmentbölümlerihis / her departments
ourbölümübüzour departmentbölümleribizour departments
you all'sbölümügüzyou all's departmentbölümlerigizyou all's departments
theirbölümleritheir departmentbölümleritheir departments

The overlap in the last rows is real, not a mistake: bölümleri can mean "his / her departments", "their department", or "their departments" — context decides.