külkü

/kylky/

Cases

SingularPluralWhen to use it
nominativekülküthe laughterkülkülethe laughtersthe plain dictionary form — the doer of the sentence
genitivekülkünüthe laughter'skülkülenithe laughters'the owner — whose it is
accusativekülkünüthe laughter (as the object)külkülenithe laughters (as the object)a specific, known object — whom or what
dativekülkügeto the laughterkülkülegeto the laughtersdirection or recipient — to where, to whom
locativekülküdeat / in the laughterkülküledeat / in the laughterswhere it is; also having — mende bar, "I have it"
ablativekülküdenfrom the laughterkülküledenfrom the laughterswhere 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
mykülkümmy laughterkülkülerimmy laughters
yourkülküngyour laughterkülküleringyour laughters
his / herkülküsühis / her laughterkülkülerihis / her laughters
ourkülkübüzour laughterkülküleribizour laughters
you all'skülkügüzyou all's laughterkülkülerigizyou all's laughters
theirkülküleritheir laughterkülküleritheir laughters

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