What is the shabd roop of chakshu in sanskrit?

the mool roop of chakshu is 'chakshush' i'm not sure abt its shabd roop

chakShuH - chakShuShI-chakShUMShi |

chakShuH- chakShuShI-chakShUMShi |

chakShuShA-chakShurbhyAm-chakShurbhiH|

chakShuShe-chkShurbhyAm-chakShurbhyaH|

chakShuShaH-chakShurbhyAm-chakShurbhyaH|

chakShuShaH-chakShuShoH-chakShuShAm|

chkShuShi-chakShuShoH-chakShuShShu

he chakShuH ! he chakShuShI! he chakShUMShi