Choose or find odd word - Peak , Mountain , Hillock , Mound , Valley

E. VALLEY

Choose or find odd word - Vikramaditya , Chandragupta , Harshavardhana , Chanakya , Samudragupta

D. CHANAKYA

Choose or find odd word - Tortoise , Duck , Snake , Whale , Crow

D. WHALE

Choose or find odd pair of words - (Stamp : Letter) , (Ticket : Train) , (Ink : Pen) , (Cae : Engine)

D. CAE : ENGINE

Choose or find odd word - Nerves , Auricle , Artery , Valve , Aorta

A. NERVES