Choose or find odd word - Raid , Attack , Assault , Defence , Ambush

D. DEFENCE

Choose or find odd word - Epicentre , Seismology , Focus , Crater , Richter Scale

D. CRATER

Choose or find odd word - Calendar , Year , Date , Month , Day

A. CALENDAR

Choose or find odd word - Arrow , Axe , Knife , Dagger , Sword

A. ARROW

Choose or find odd word - Galileo , Copernicus , Columbus , Bhaskara , Aryabhatta

C. COLUMBUS