orden

/orden/

Cases

SingularPluralWhen to use it
nominativeordenthe decorationordenlethe decorationsthe plain dictionary form — the doer of the sentence
genitiveordennithe decoration'sordenlenithe decorations'the owner — whose it is
accusativeordennithe decoration (as the object)ordenlenithe decorations (as the object)a specific, known object — whom or what
dativeordengeto the decorationordenlegeto the decorationsdirection or recipient — to where, to whom
locativeordendeat / in the decorationordenledeat / in the decorationswhere it is; also having — mende bar, "I have it"
ablativeordendenfrom the decorationordenledenfrom the decorationswhere 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
myordenimmy decorationordenlerimmy decorations
yourordeningyour decorationordenleringyour decorations
his / herordenihis / her decorationordenlerihis / her decorations
ourordenibizour decorationordenleribizour decorations
you all'sordenigizyou all's decorationordenlerigizyou all's decorations
theirordenleritheir decorationordenleritheir decorations

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