They also have the unique ability to be able to ressurect dead players. Druids can not ressurect and do not get specialist spells versus undead. They do however get pretty good buffing spells and healing spells. Generally druids get the same healing spells as a cleric only one circle later. They do not however get the complete heal spell that is cleric specific.
Wizards are powerful casters whose mastery is in dishing damage.
Wizards also have great teleport and group teleport spells up to and including teleportation into other planes. Other classes will trade positions from time to time as they get new and more powerful spells however druids never fall too far behind. Rangers are the other nature loving class in the game. They also have the forage and tracking skills. Druids get these same skills only at later levels.