omonim

/omonim/

Cases

SingularPluralWhen to use it
nominativeomonimthe homonymomonimlethe homonymsthe plain dictionary form — the doer of the sentence
genitiveomonimnithe homonym'somonimlenithe homonyms'the owner — whose it is
accusativeomonimnithe homonym (as the object)omonimlenithe homonyms (as the object)a specific, known object — whom or what
dativeomonimgeto the homonymomonimlegeto the homonymsdirection or recipient — to where, to whom
locativeomonimdeat / in the homonymomonimledeat / in the homonymswhere it is; also having — mende bar, "I have it"
ablativeomonimdenfrom the homonymomonimledenfrom the homonymswhere 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
myomonimimmy homonymomonimlerimmy homonyms
youromonimingyour homonymomonimleringyour homonyms
his / heromonimihis / her homonymomonimlerihis / her homonyms
ouromonimibizour homonymomonimleribizour homonyms
you all'somonimigizyou all's homonymomonimlerigizyou all's homonyms
theiromonimleritheir homonymomonimleritheir homonyms

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