In 'Zombie Lane' weapons are either classified as:
Standard weapons are good against weaker zombies. The first weapon a player is equipped with is a standard weapon (the Shovel).
Crafted weapons are usually more powerful and do more than one damage per strike. Super Strong Zombies, such as Riot Zombies, can only be damaged by crafted weapons.
Melee weapons are good against weaker zombies which can be killed in one hit. If the zombie is not killed in the first hit it will retaliate and stun the player.
Ranged weapons are good for killing zombies which require more than one hit to kill, since you are not within the zombies range.