ağartıwçu

/ aʁartɯwtʃu /

Cases

SingularPluralWhen to use it
nominative ağartıwçu the one who whitens ağartıwçula the one who whitenses the plain dictionary form — the doer of the sentence
genitive ağartıwçunu the one who whitens' ağartıwçulanı the one who whitenses' the owner — whose it is
accusative ağartıwçunu the one who whitens (as the object) ağartıwçulanı the one who whitenses (as the object) a specific, known object — whom or what
dative ağartıwçuğa to the one who whitens ağartıwçulağa to the one who whitenses direction or recipient — to where, to whom
locative ağartıwçuda at / in the one who whitens ağartıwçulada at / in the one who whitenses where it is; also having — mende bar, "I have it"
ablative ağartıwçudan from the one who whitens ağartıwçuladan from the one who whitenses 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
my ağartıwçum my one who whitens ağartıwçularım my one who whitenses
your ağartıwçuŋ your one who whitens ağartıwçularıŋ your one who whitenses
his / her ağartıwçusu his / her one who whitens ağartıwçuları his / her one who whitenses
our ağartıwçubuz our one who whitens ağartıwçularıbız our one who whitenses
you all's ağartıwçuğuz you all's one who whitens ağartıwçularığız you all's one who whitenses
their ağartıwçuları their one who whitens ağartıwçuları their one who whitenses

The overlap in the last rows is real, not a mistake: ağartıwçuları can mean "his / her one who whitenses", "their one who whitens", or "their one who whitenses" — context decides.