A long spear carried by knights is called a lance. It was a common weapon used in jousting tournaments and battle scenarios by mounted warriors.
lance
In the ancient Roman legions, one of the main weapons of their soldiers was the javelin. This we could call a spear as per the question. There were several innovations made to the javelin that made it a very effective weapon. One example of this was a javelin that after it struck a target, the head of the javelin would bend making it impossible for the enemy to throw the javelin back to the Roman soldiers.
Athena carried a spear, shield, and an owl.
the javelin was called a pilum, but it could hardly be called a spear, it had adapted to the role of being thrown so much that it would be useless to stab with.
lance
pikeman, or any spear unit who can counter the cavalry.
he carried a spear
Athena usually carried an Aigis clock, shield and spear. The spear was called a pallein, Athena was connected with various personas called Pallas so much so her name could be rendered as Pallas Athena.
Steed (any horse that was ridden, not necessarily by a knight however);Charger (a group of different types of warhorse);Horse (could be either singular or plural);Warhorse (could refer to almost any kind);Destrier;Courser;Rouncey (the last three being types of charger);Palfrey (these were not warhorses, but rather used when travelling long distance).
Athena carried a spear and a shield to protect herself in a battle.
Goliath. And it was a spear, not an ordinary staff.
A two-tipped spear is called a double-headed spear or a double-bladed spear. It is designed with a blade at both ends for increased versatility and effectiveness in combat.