Poles
Poleaxe, Polearm, Polehammer, Bec de corbin, Bec de faucon
These were all different kinds of poles with varying heads on the top, such as an axe (in the poleaxe).
Bill
A polearm with a wide cutting blade, sometimes with spikes or hooks. It was used against mounted soldiers. The blade at the top was curved, so the point was combined with a large swing to cut through armor.
Caltrop
A 12-18 foot pole with sharp spikes on top; used to maim horses. (Mahabal)